From fa3eec7791b0fe27e3112804a71ba445ff336a6b Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@kernel.org>
Date: Wed, 1 Jul 2015 23:51:43 +0100
Subject: [PATCH] regmap: Silence warning on invalid zero length read

Zero length reads make no sense in a regmap context and are likely to
trigger bugs further down the stack so insert an error check, also
silencing compiler warnings about use of ret in cases where we iterate
per register.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@kernel.org>
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