NS: log address:port on error

Change-Id: If2dc533a6dc150254f5d44b672f04bb728e7e927
diff --git a/src/gb/gprs_ns.c b/src/gb/gprs_ns.c
index 3679a5b..cee4885 100644
--- a/src/gb/gprs_ns.c
+++ b/src/gb/gprs_ns.c
@@ -1963,8 +1963,8 @@
 	ret = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE - NS_ALLOC_HEADROOM, 0,
 			(struct sockaddr *)saddr, &saddr_len);
 	if (ret < 0) {
-		LOGP(DNS, LOGL_ERROR, "recv error %s during NSIP recv\n",
-			strerror(errno));
+		LOGP(DNS, LOGL_ERROR, "recv error %s during NSIP recvfrom %s\n",
+		     strerror(errno), osmo_sock_get_name2(bfd->fd));
 		msgb_free(msg);
 		*error = ret;
 		return NULL;