ASoC: madera: Correct error path handling in madera_out1_demux_put

Should the write to MADERA_OUTPUT_ENABLES_1 fail and out_clamp[0] not be
set an additional error message will be printed. Clear the ret variable
to avoid this.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20200114161841.451-3-ckeepax@opensource.cirrus.com


Signed-off-by: Mark Brown <broonie@kernel.org>