ASoC: xlnx: fix error handling in xlnx_formatter_pcm_probe

Currently, if platform_get_irq_byname() fails, the returned error
turns into a huge value, once it is being store into a variable
of type unsigned int, hence never actually reporting any error
and causing unexpected behavior when using the values stored
in aud_drv_data->s2mm_irq and aud_drv_data->mm2s_irq.

Fix this by changing the type of variables s2mm_irq and mm2s_irq in
structure xlnx_pcm_drv_data from unsigned int to int.

Addresses-Coverity-ID: 1476096 ("Unsigned compared against 0")
Fixes: 796175a94a7f ("ASoC: xlnx: add pcm formatter platform driver")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/xilinx/xlnx_formatter_pcm.c

@@ -76,8 +76,8 @@ struct xlnx_pcm_drv_data {
 	void __iomem *mmio;
 	bool s2mm_presence;
 	bool mm2s_presence;
-	unsigned int s2mm_irq;
-	unsigned int mm2s_irq;
+	int s2mm_irq;
+	int mm2s_irq;
 	struct snd_pcm_substream *play_stream;
 	struct snd_pcm_substream *capture_stream;
 	struct clk *axi_clk;