[PATCH] configfs: Include linux/err.h in linux/configfs.h

We now use PTR_ERR() in the ->make_item() and ->make_group() operations.
Folks including configfs.h need err.h.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 179589b..2495f23 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1094,7 +1094,7 @@
 	kfree(name);
 	if (ret) {
 		/*
-		 * If item == NULL, then link_obj() was never called.
+		 * If ret != 0, then link_obj() was never called.
 		 * There are no extra references to clean up.
 		 */
 		goto out_put;