ceph: simplify ceph_msg_new

We only need to pass in front_len.  Callers can attach any other payload
pieces (middle, data) as they see fit.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/msgpool.c b/fs/ceph/msgpool.c
index 04fea84..10d3632 100644
--- a/fs/ceph/msgpool.c
+++ b/fs/ceph/msgpool.c
@@ -11,7 +11,7 @@
 {
 	struct ceph_msgpool *pool = arg;
 
-	return ceph_msg_new(0, pool->front_len, 0, 0, NULL);
+	return ceph_msg_new(0, pool->front_len);
 }
 
 static void free_fn(void *element, void *arg)
@@ -43,7 +43,7 @@
 		WARN_ON(1);
 
 		/* try to alloc a fresh message */
-		return ceph_msg_new(0, front_len, 0, 0, NULL);
+		return ceph_msg_new(0, front_len);
 	}
 
 	return mempool_alloc(pool->pool, GFP_NOFS);