Free send attempts to disconnected clients

Callers who send to specific client connections can get -ENOTCONN if
their client has gone away.   We forgot to free the send tracking struct
in that case.

Signed-off-by: Zach Brown <zab@versity.com>

kmod/src/net.c

@@ -355,6 +355,7 @@ static int submit_send(struct super_block *sb,
 		}
 		if (rid != 0) {
 			spin_unlock(&conn->lock);
+			kfree(msend);
 			return -ENOTCONN;
 		}
 	}