ASoC: amd: fix uninitialized variable in snd_acp6x_probe()

The "index" is potentially used without being initialized on the error
path.

Fixes: fc329c1de498 ("ASoC: amd: add platform devices for acp6x pdm driver and dmic driver")
Signed-off-by: Dan Carpenter <[e-mail]>
Link: https://lore.kernel.org/r/20211130125633.GA24941@kili
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/amd/yc/pci-acp6x.c

···
 {
 	struct acp6x_dev_data *adata;
 	struct platform_device_info pdevinfo[ACP6x_DEVS];
-	int ret, index;
+	int index = 0;
 	int val = 0x00;
 	u32 addr;
 	unsigned int irqflags;
+	int ret;
 
 	irqflags = IRQF_SHARED;
 	/* Yellow Carp device check */