fix moutpoint_mutex deadlock when rtsp reconnect fail (#2542)

plugins/janus_streaming.c

@@ -6473,7 +6473,10 @@ static int janus_streaming_rtsp_connect_to_server(janus_streaming_mountpoint *mp
 	abase[0] = '\0';
 	int asport = 0, asport_rtcp = 0;
 	multiple_fds audio_fds = {-1, -1};
-
+
+	if(g_atomic_int_get(&mp->destroyed)){
+		return -8;
+	}
 	janus_mutex_lock(&mountpoints_mutex);
 	/* Parse both video and audio first before proceed to setup as curldata will be reused */
 	int vresult = -1;
@@ -7629,6 +7632,8 @@ static void *janus_streaming_relay_thread(void *data) {
 					close(source->video_rtcp_fd);
 				}
 				source->video_rtcp_fd = -1;
+				if(g_atomic_int_get(&mountpoint->destroyed))
+					break;
 				/* Now let's try to reconnect */
 				if(janus_streaming_rtsp_connect_to_server(mountpoint) < 0) {
 					/* Reconnection failed? Let's try again later */