pimd: capture pim_msg_send_frame return

It's valuable to capture the return from
 and log the error. Otherwise, send failures will be silently ignored.

Testing Done:
pim-min, pim-smoke,

Signed-off-by: Rajesh Varatharaj <[email protected]>

pimd/pim_iface.c

@@ -958,7 +958,7 @@ static int pim_iface_next_vif_index(struct interface *ifp)
 }
 
 /*
-  pim_if_add_vif() uses ifindex as vif_index
+  pim_if_add_vif() uses ifindex as mroute_vif_index
 
   see also pim_if_find_vifindex_by_ifindex()
  */

pimd/pim_pim.c

@@ -717,19 +717,17 @@ int pim_msg_send(int fd, pim_addr src, pim_addr dst, uint8_t *pim_msg,
 		pim_pkt_dump(__func__, pim_msg, pim_msg_size);
 	}
 
-	pim_msg_send_frame(fd, (char *)buffer, sendlen, (struct sockaddr *)&to,
-			   tolen, ifp->name);
-	return 0;
+	return pim_msg_send_frame(fd, (char *)buffer, sendlen,
+				  (struct sockaddr *)&to, tolen, ifp->name);
 
 #else
 	struct iovec iovector[2];
 
 	iovector[0].iov_base = pim_msg;
 	iovector[0].iov_len = pim_msg_size;
 
-	pim_msg_send_frame(src, dst, ifp->ifindex, &iovector[0], fd);
+	return pim_msg_send_frame(src, dst, ifp->ifindex, &iovector[0], fd);
 
-	return 0;
 #endif
 }