From db8fa7311d1ce642134c53e175ca0ae35e021344 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <jic23@kernel.org>
Date: Fri, 3 Jan 2014 22:02:00 +0000
Subject: [PATCH] iio:adc:vf610 ensure correct handing of interruption of wait
 for completion

Issue highlighted by smatch warning:

CHECK   drivers/iio/adc/vf610_adc.c
drivers/iio/adc/vf610_adc.c:466 vf610_read_raw() warn: unsigned 'ret' is never less than zero.

As wait_for_completion_interruptible_timeout can return -ERESTARTSTSYS, if
interrupted, ret must be signed.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Fugang Duan <B38611@freescale.com>
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