mm: cleancache: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: linux-mm@kvack.org
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

mm/cleancache.c

@@ -305,8 +305,7 @@ static int __init init_cleancache(void)
 {
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *root = debugfs_create_dir("cleancache", NULL);
-	if (root == NULL)
-		return -ENXIO;
+
 	debugfs_create_u64("succ_gets", 0444, root, &cleancache_succ_gets);
 	debugfs_create_u64("failed_gets", 0444, root, &cleancache_failed_gets);
 	debugfs_create_u64("puts", 0444, root, &cleancache_puts);