RDS: Call rds_send_xmit() directly from sendmsg()

rds_sendmsg() is calling the send worker function to
send the just-queued datagrams, presumably because it wants
the behavior where anything not sent will re-call the send
worker. We now ensure all queued datagrams are sent by retrying
from the send completion handler, so this isn't needed any more.
Signed-off-by: NAndy Grover <andy.grover@oracle.com>

net/rds/send.c

@@ -1073,7 +1073,7 @@ int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 	rds_stats_inc(s_send_queued);
 
 	if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags))
-		rds_send_worker(&conn->c_send_w.work);
+		rds_send_xmit(conn);
 
 	rds_message_put(rm);
 	return payload_len;