treewide: Unchecked return value from library, CWE-252

All instances were harmless, but it might be useful to have some
debug messages here and there. Reported by Coverity.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/udp.c b/udp.c
index 1c0fdc6..cbd3ac8 100644
--- a/udp.c
+++ b/udp.c
@@ -938,7 +938,8 @@ void udp_sock_handler(const struct ctx *c, union epoll_ref ref, uint32_t events,
 
 			last_mh->msg_iov = &last_mh->msg_iov[i];
 
-			sendmsg(c->fd_tap, last_mh, MSG_NOSIGNAL);
+			if (sendmsg(c->fd_tap, last_mh, MSG_NOSIGNAL) < 0)
+				debug("UDP: %li bytes to tap missing", missing);
 
 			*iov_base -= first_offset;
 			break;