hugetlbfs: return error code when initializing module

Return an errno upon failure to create inode kmem cache, and unregister
the FS upon failure to mount.

[akpm@linux-foundation.org: remove unneeded test of `error']
Signed-off-by: Hillf Danton <dhillf@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/hugetlbfs/inode.c

@@ -1021,6 +1021,7 @@ static int __init init_hugetlbfs_fs(void)
 	if (error)
 		return error;
 
+	error = -ENOMEM;
 	hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
 					sizeof(struct hugetlbfs_inode_info),
 					0, 0, init_once);
@@ -1039,9 +1040,9 @@ static int __init init_hugetlbfs_fs(void)
 	}
 
 	error = PTR_ERR(vfsmount);
+	unregister_filesystem(&hugetlbfs_fs_type);
 
  out:
-	if (error)
 	kmem_cache_destroy(hugetlbfs_inode_cachep);
  out2:
 	bdi_destroy(&hugetlbfs_backing_dev_info);