ASoC: bcm: cygnus-pcm: Fix unused assignment about 'rc'

Delete unused initialized value of 'rc', because it will
be assigned by the function devm_request_irq().
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20210728124411.3168-1-tangbin@cmss.chinamobile.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/bcm/cygnus-pcm.c

@@ -729,7 +729,7 @@ static struct snd_soc_component_driver cygnus_soc_platform = {
 int cygnus_soc_platform_register(struct device *dev,
 				 struct cygnus_audio *cygaud)
 {
-	int rc = 0;
+	int rc;
 
 	dev_dbg(dev, "%s Enter\n", __func__);