ceph: Use kzalloc

Use kzalloc rather than the combination of kmalloc and memset.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,size,flags;
statement S;
@@

-x = kmalloc(size,flags);
+x = kzalloc(size,flags);
 if (x == NULL) S
-memset(x, 0, size);
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/mon_client.c

@@ -481,11 +481,10 @@ int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
 	struct ceph_mon_statfs *h;
 	int err;
 
-	req = kmalloc(sizeof(*req), GFP_NOFS);
+	req = kzalloc(sizeof(*req), GFP_NOFS);
 	if (!req)
 		return -ENOMEM;
 
-	memset(req, 0, sizeof(*req));
 	kref_init(&req->kref);
 	req->buf = buf;
 	init_completion(&req->completion);