server: Check socket flags after all sockets got processed.

In rare cases we get an event during the second iteration of the loop,
changing the first element. This would lead to an assertion later.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55054

server/sock.c

@@ -3509,7 +3509,10 @@ static void poll_socket( struct sock *poll_sock, struct async *async, int exclus
             req->sockets[i].flags |= AFD_POLL_CONNECT_ERR;
             req->sockets[i].status = sock_get_ntstatus( sock->errors[AFD_POLL_BIT_CONNECT_ERR] );
         }
+    }
 
+    for (i = 0; i < count; ++i)
+    {
         if (req->sockets[i].flags)
             signaled = TRUE;
     }