ASoC: fsl_micfil: Fix unused assignment in fsl_set_clock_params()

Delete unused initialized value of 'ret', because it will
be assigned by the function fsl_micfil_set_mclk_rate().

Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20200518110040.18036-1-tangbin@cmss.chinamobile.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_micfil.c

@@ -295,7 +295,7 @@ static int fsl_set_clock_params(struct device *dev, unsigned int rate)
 {
 	struct fsl_micfil *micfil = dev_get_drvdata(dev);
 	int clk_div;
-	int ret = 0;
+	int ret;
 
 	ret = fsl_micfil_set_mclk_rate(micfil, rate);
 	if (ret < 0)