bfdd: fix coverity scan resource leak

Close the descriptor if something fails and we don't return it.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

bfdd/bfd_packet.c

@@ -1569,6 +1569,7 @@ int bp_echo_socket(const struct vrf *vrf)
 	    -1) {
 		zlog_warn("%s: setsockopt(SO_ATTACH_FILTER): %s", __func__,
 			  strerror(errno));
+		close(s);
 		return -1;
 	}
 
@@ -1579,6 +1580,7 @@ int bp_echo_socket(const struct vrf *vrf)
 	if (bind(s, (struct sockaddr *)&sll, sizeof(sll)) < 0) {
 		zlog_warn("Failed to bind echo socket: %s",
 			  safe_strerror(errno));
+		close(s);
 		return -1;
 	}