ASoC: meson: aiu: fix irq registration

ASoC: meson: aiu: fix irq registration

The aiu stored the irq in an unsigned integer which may have discarded an
error returned by platform_get_irq_byname(). This is incorrect and should
have been a signed integer.

Also drop the irq error traces from the probe function as this is already
done by platform_get_irq_byname().

Fixes: dd8a6eff9a9e ("ASoC: meson: aiu: add i2s and spdif support")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20200214131350.337968-4-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>