ASoC: amd: acp5x-pcm-dma: Fix signedness bug

In acp5x_audio_probe() platform_get_irq() may return error, but i2s_irq now
is unsigned int so the error handling is never triggered.

Fixes: 87d71a12 ("ASoC: amd: pcm-dma: Use platform_get_irq() to get the interrupt")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20220305123705.3708-1-yuehaibing@huawei.com


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