From cbaab2db9103cc6727c7166d2fda9f64038c828c Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 22 Jan 2015 02:49:00 -0500
Subject: [PATCH] simpler calling conventions for filename_mountpoint()

a) make it accept ERR_PTR() as filename (and return its PTR_ERR() in that case)
b) make it putname() the sucker in the end otherwise

simplifies life for callers...

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