Fix inet_drv to detect passive mode UDP errors for SCTP builds

Debug and patch by Per Hedeland for R13B04 on erlang-patches:
  Connected UDP (and handling of any other errors in UDP recv())
  is broken in passive mode for all SCTP-enabled builds.

erts/emulator/drivers/common/inet_drv.c

@@ -9333,11 +9333,13 @@ static int packet_inet_input(udp_descriptor* udesc, HANDLE event)
 	    if (err != ERRNO_BLOCK) {
 		if (!desc->active) {
 #ifdef HAVE_SCTP
-		    if (short_recv)
+		    if (short_recv) {
 			async_error_am(desc, am_short_recv);
-		    else
-#else
+		    } else {
 			async_error(desc, err);
+		    }
+#else
+		    async_error(desc, err);
 #endif
 		    driver_cancel_timer(desc->port);
 		    sock_select(desc,FD_READ,0);

lib/kernel/test/gen_udp_SUITE.erl

@@ -34,12 +34,12 @@
 
 -export([send_to_closed/1, 
 	 buffer_size/1, binary_passive_recv/1, bad_address/1,
-	 read_packets/1, open_fd/1]).
+	 read_packets/1, open_fd/1, connect/1]).
 
 all(suite) ->
     [send_to_closed, 
      buffer_size, binary_passive_recv, bad_address, read_packets,
-     open_fd].
+     open_fd, connect].
 
 init_per_testcase(_Case, Config) ->
     ?line Dog=test_server:timetrap(?default_timeout),
@@ -408,3 +408,20 @@ start_node(Name) ->
 
 stop_node(Node) ->
     ?t:stop_node(Node).
+
+
+connect(suite) ->
+    [];
+connect(doc) ->
+    ["Test that connect/3 has effect"];
+connect(Config) when is_list(Config) ->
+    Addr = {127,0,0,1},
+    {ok,S1} = gen_udp:open(0),
+    {ok,P1} = inet:port(S1),
+    {ok,S2} = gen_udp:open(0),
+    ok = inet:setopts(S2, [{active,false}]),
+    ok = gen_udp:close(S1),
+    ok = gen_udp:connect(S2, Addr, P1),
+    ok = gen_udp:send(S2, <<16#deadbeef:32>>),
+    {error,econnrefused} = gen_udp:recv(S2, 0, 5),
+    ok.