ASoC: wm8904: harmless underflow in wm8904_put_deemph()
We try to check that "deemph" is zero or one, but because of an underflow bug, it can also be negative. It's fine, negative values are handled as non-zero. But it's messy and static checkers complain so let's fix it. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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