ceph: code cleanup

Mainly fixing minor issues reported by sparse.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/osdmap.c b/fs/ceph/osdmap.c
index 416d46a..46b391d 100644
--- a/fs/ceph/osdmap.c
+++ b/fs/ceph/osdmap.c
@@ -424,7 +424,7 @@
 	kfree(pi);
 }
 
-void __decode_pool(void **p, struct ceph_pg_pool_info *pi)
+static void __decode_pool(void **p, struct ceph_pg_pool_info *pi)
 {
 	ceph_decode_copy(p, &pi->v, sizeof(pi->v));
 	calc_pg_masks(pi);