Properly set buffer size when calling getsockopt()

src/xpdev/sockwrap.c

@@ -569,6 +569,7 @@ int nonblocking_connect(SOCKET sock, struct sockaddr* addr, size_t size, unsigne
 				result = 0;
 			}
 			else {
+				optlen = sizeof(result);
 				if(getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)&result, &optlen)==SOCKET_ERROR)
 					result=ERROR_VALUE;
 			}