urldata: remove 'hostname' from struct Curl_async

[bagder]

It is unnecessary duplicated information, as the host name being resolved is already present in conn->host.

[testclutch]

Analysis of PR #16451 at 2fe216e5:

Test 241 failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 3 different CI jobs (the link just goes to one of them).

Generated by Testclutch

[vszakats]

Sorry for commenting here and not opening a new issue.
It seems this update breaks test 241 consistently on Old Linux:
https://github.com/curl/curl/actions/runs/13571000683/job/37935725529#step:12:637

test 0241...[HTTP-IPv6 GET (using ip6-localhost)]

 241: protocol FAILED!
 There was no content at all in the file log/9/server.input.
 Server glitch? Total curl failure? Returned: 7
== Contents of files in the log/9/ dir after test 241
=== Start of file http_ipv6_server.log
 16:21:57.102688 Running HTTP IPv6 version on port 45651
 16:21:57.102836 Wrote pid 13912 to log/9/server/http_ipv6_server.pid
 16:21:57.102903 Wrote port 45651 to log/9/server/http_ipv6_server.port
 16:21:58.051784 ====> Client connect
 16:21:58.051825 accept_connection 3 returned 4
 16:21:58.051859 accept_connection 3 returned 0
 16:21:58.051891 Read 93 bytes
 16:21:58.051917 Process 93 bytes request
 16:21:58.051945 Got request: GET /verifiedserver HTTP/1.1
 16:21:58.051970 Are-we-friendly question received
 16:21:58.052043 Wrote request (93 bytes) input to log/9/server.input
 16:21:58.052093 Identifying ourselves as friends
 16:21:58.052211 Response sent (56 bytes) and written to log/9/server.response
 16:21:58.052242 special request received, no persistency
 16:21:58.052275 ====> Client disconnect 0
=== End of file http_ipv6_server.log
=== Start of file http_ipv6_verify.log
 *   Trying [::1]:45651...
 * Connected to ::1 (::1) port 45651
 * using HTTP/1.x
 > GET /verifiedserver HTTP/1.1
 > Host: [::1]:45651
 > User-Agent: curl/8.13.0-DEV
 > Accept: */*
 > 
 * Request completely sent off
 < HTTP/1.1 200 OK
 < Content-Length: 17
 < 
 { [17 bytes data]
 * Connection #0 to host ::1 left intact
=== End of file http_ipv6_verify.log
=== Start of file http_ipv6_verify.out
 WE ROOLZ: 13912
=== End of file http_ipv6_verify.out
=== Start of file server.cmd
 Testnum 241
=== End of file server.cmd
=== Start of file server.response
 HTTP/1.1 200 OK
 Content-Length: 17
 WE ROOLZ: 13912
=== End of file server.response
=== Start of file stderr241
   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                  Dload  Upload   Total   Spent    Left  Speed
 
   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
 curl: (7) Failed to connect to ip6-localhost port 45651 after 4 ms: Could not connect to server
=== End of file stderr241
=== Start of file trace241
 16:21:58.047612 [0-x] == Info: [0-x] [MULTI] [INIT] added, transfers=1
 16:21:58.047692 [0-x] == Info: [0-x] [MULTI] [INIT] multi_perform(running=1)
 16:21:58.047700 [0-x] == Info: [0-x] [MULTI] [INIT] -> [SETUP]
 16:21:58.047703 [0-x] == Info: [0-x] [MULTI] [SETUP] -> [CONNECT]
 16:21:58.047706 [0-x] == Info: [0-x] [READ] client_reset, clear readers
 16:21:58.048950 [0-0] == Info: [0-0] [MULTI] [CONNECT] -> [RESOLVING]
 16:21:58.049318 [0-0] == Info: [0-0] [MULTI] [RESOLVING] multi_wait pollset[fd=5 IN], timeouts=2
 16:21:58.051813 [0-0] == Info: [0-0] [MULTI] [RESOLVING] multi_perform(running=1)
 16:21:58.051844 [0-0] == Info: [0-0] [MULTI] [RESOLVING] Curl_multi_will_close fd=5
 16:21:58.051857 [0-0] == Info: [0-0] Host ip6-localhost:0 was resolved.
 16:21:58.051862 [0-0] == Info: [0-0] IPv6: ::1
 16:21:58.051864 [0-0] == Info: [0-0] IPv4: (none)
 16:21:58.051866 [0-0] == Info: [0-0] [SETUP] added
 16:21:58.051869 [0-0] == Info: [0-0] [MULTI] [RESOLVING] -> [CONNECTING]
 16:21:58.051872 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] created ipv6 (timeout 299996ms)
 16:21:58.051875 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] ipv6 starting (timeout=299996ms)
 16:21:58.051886 [0-0] == Info: [0-0]   Trying [::1]:0...
 16:21:58.051894 [0-0] == Info: [0-0] [TCP] cf_socket_open() -> 0, fd=5
 16:21:58.051941 [0-0] == Info: [0-0] [TCP] local address ::1 port 56898...
 16:21:58.051944 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] ipv6 connect -> 0, connected=0
 16:21:58.051946 [0-0] == Info: [0-0] [SETUP] Curl_conn_connect(block=0) -> 0, done=0
 16:21:58.051951 [0-0] == Info: [0-0] [TCP] adjust_pollset, !connected, POLLOUT fd=5
 16:21:58.051953 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] adjust_pollset -> 1 socks
 16:21:58.051955 [0-0] == Info: [0-0] [MULTI] [CONNECTING] multi_wait pollset[fd=5 OUT], timeouts=2
 16:21:58.051960 [0-0] == Info: [0-0] [MULTI] [CONNECTING] multi_perform(running=1)
 16:21:58.051970 [0-0] == Info: [0-0] connect to ::1 port 0 from ::1 port 56898 failed: Connection refused
 16:21:58.051973 [0-0] == Info: [0-0] [MULTI] [CONNECTING] Curl_multi_will_close fd=5
 16:21:58.051981 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] ipv6 connect -> 7, connected=0
 16:21:58.051982 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] ipv6 done
 16:21:58.051984 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] all eyeballers failed
 16:21:58.051986 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] ipv6 assess started=1, result=7
 16:21:58.051990 [0-0] == Info: Failed to connect to ip6-localhost port 45651 after 4 ms: Could not connect to server
 16:21:58.051993 [0-0] == Info: [0-0] [SETUP] Curl_conn_connect(block=0) -> 7, done=0
 16:21:58.051995 [0-0] == Info: [0-0] [SETUP] Curl_conn_connect(), filter returned 7
 16:21:58.051997 [0-0] == Info: [0-0] [MULTI] [CONNECTING] multi_done: status: 7 prem: 1 done: 0
 16:21:58.052093 [0-0] == Info: [0-0] [WRITE] [OUT] done
 16:21:58.052097 [0-0] == Info: [0-0] [MULTI] [CONNECTING] multi_done, not reusing connection=0, forbid=0, close=0, premature=1, conn_multiplex=0
 16:21:58.052101 [0-0] == Info: [0-0] closing connection #0
 16:21:58.052103 [0-0] == Info: [0-0] [MULTI] [CONNECTING] [CPOOL] closing connection
 16:21:58.052105 [0-0] == Info: [0-0] [SETUP] close
 16:21:58.052107 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] close
 16:21:58.052109 [0-0] == Info: [0-0] [TCP] destroy
 16:21:58.052110 [0-0] == Info: [0-0] [HAPPY-EYEBALLS] destroy
 16:21:58.052112 [0-0] == Info: [0-0] [SETUP] destroy
 16:21:58.052115 [0-0] == Info: [0-0] [MULTI] [CONNECTING] [CPOOL] trigger multi connchanged
 16:21:58.052117 [0-0] == Info: [0-0] [MULTI] [CONNECTING] -> [COMPLETED]
 16:21:58.052119 [0-0] == Info: [0-0] [MULTI] [COMPLETED] Expire cleared
 16:21:58.052121 [0-0] == Info: [0-0] [MULTI] [COMPLETED] -> [MSGSENT]
 16:21:58.052124 [0-0] == Info: [0-0] [MULTI] [COMPLETED] removed, transfers=0
=== End of file trace241