ceph: don't return a value from void function

This fixes a build warning to that effect.

Fixes: 1a829ff2 ("ceph: no need to check return value of debugfs_create functions")
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/debugfs.c

@@ -294,7 +294,6 @@ void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
 
 void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
 {
-	return 0;
 }
 
 void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)