Use-after-free bug in curl_multi_remove_handle()

[MaxKellermann]

59041f0 introduces a use-after-free bug in CURL 7.67.0 from inside curl_multi_remove_handle()

See MusicPlayerDaemon/MPD#681 (comment) for an explanation.

[bagder]

@MaxKellermann, does #4583 fix the issue for you?

[eworm-de]

It does. (I am involved in the downstream Arch Linux bug report.)
Thanks a lot!