From 5c31b6cedb675199bfd18c08a1223c9b39daedd7 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 12 May 2015 17:32:54 -0400
Subject: [PATCH] namei: saner calling conventions for filename_parentat()

a) make it reject ERR_PTR() for name
b) make it putname(name) on all other failure exits
c) make it return name on success

again, simplifies the callers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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