From 4ea14a53d8f881034fa9e186653821c4e3d9a8fb Mon Sep 17 00:00:00 2001
From: Peng Fan <van.freenix@gmail.com>
Date: Mon, 24 Aug 2015 10:42:25 -0700
Subject: [PATCH] Input: gpio-keys - report error when disabling unsupported
 key

When trying to disable a key that is not supported by the device we should
report error, not do nothing and report success:

root@yocto:/sys/devices/soc0/gpio-keys# cat keys
114-116
root@yocto:/sys/devices/soc0/gpio-keys# echo 77 > keys
root@yocto:/sys/devices/soc0/gpio-keys#

We want 'echo 77 > keys' to report an error, but silence to give us an
illusion that all is 'ok'.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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