avformat/udp: Close the socket after destroying the thread using the socket

for send() this cannot work and even for recv() it feels very wrong and hackish
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/udp.c

@@ -1109,7 +1109,6 @@ static int udp_close(URLContext *h)
 
     if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
         udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage);
-    closesocket(s->udp_fd);
 #if HAVE_PTHREAD_CANCEL
     if (s->thread_started) {
         int ret;
@@ -1123,6 +1122,7 @@ static int udp_close(URLContext *h)
         pthread_cond_destroy(&s->cond);
     }
 #endif
+    closesocket(s->udp_fd);
     av_fifo_freep(&s->fifo);
     return 0;
 }