fixup! fixup! WIP: print uv_udp_init_ex() error\n

lib/isc/netmgr/udp.c

@@ -223,6 +223,10 @@ isc__nm_async_udplisten(isc__networker_t *worker, isc__netievent_t *ev0) {
 	uv_init_flags |= UV_UDP_RECVMMSG;
 #endif
 	r = uv_udp_init_ex(&worker->loop, &sock->uv_handle.udp, uv_init_flags);
+	if (r != 0) {
+		isc_error_fatal(__FILE__, __LINE__, "uv_udp_init_ex failed: %s",
+				uv_strerror(r));
+	}
 	RUNTIME_CHECK(r == 0);
 	uv_handle_set_data(&sock->uv_handle.handle, sock);
 	/* This keeps the socket alive after everything else is gone */