Fix memory leak when an outgoing TLS_connect() fails.

Reported by immibis in https://bugs.unrealircd.org/view.php?id=6263

doc/RELEASE-NOTES.md

@@ -113,6 +113,7 @@ HELPOP updates, fixes for streaming logs over websockets, ban exemption change a
 * Crash if there is a parse error in an included file and there are
   other remote included files still being downloaded.
 * Memory leak in WHOWAS
+* Memory leak when connecting to a TLS server fails
 * Workaround a bug in some websocket implementations where the WSOP_PONG
   frame is unmasked (now permitted).
 

src/tls.c

@@ -692,7 +692,14 @@ void unreal_tls_client_handshake(int fd, int revents, void *data)
 	switch (unreal_tls_connect(client, fd))
 	{
 		case -1:
+			SSL_set_shutdown(client->local->ssl, SSL_RECEIVED_SHUTDOWN);
+			SSL_smart_shutdown(client->local->ssl);
+			SSL_free(client->local->ssl);
+			client->local->ssl = NULL;
+			ClearTLS(client);
+			SetDeadSocket(client);
 			fd_close(fd);
+			fd_unnotify(fd);
 			client->local->fd = -1;
 			--OpenFiles;
 			return;