Correctly handle multiple clients in httpd

Signed-off-by: Rémi Denis-Courmont <rdenis@simphalempin.com>

src/network/httpd.c

@@ -2474,6 +2474,7 @@ retry:
 
             if( cl->fd != pufd->fd )
                 continue; // we were not waiting for this client
+            ++nfd;
             if( pufd->revents == 0 )
                 continue; // no event received
 
@@ -2502,8 +2503,6 @@ retry:
             {
                 cl->b_read_waiting = true;
             }
-
-            ++nfd;
         }
         vlc_mutex_unlock( &host->lock );