ASoC: davinci-mcasp: Return value handling cleanup for mcasp_common_hw_param()

Take the return value from mcasp_common_hw_param() and use that in case of
error.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/davinci/davinci-mcasp.c

@@ -631,8 +631,10 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
 
 	active_serializers = (channels + slots - 1) / slots;
 
-	if (mcasp_common_hw_param(mcasp, substream->stream, channels) == -EINVAL)
-		return -EINVAL;
+	ret = mcasp_common_hw_param(mcasp, substream->stream, channels);
+	if (ret)
+		return ret;
+
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		fifo_level = mcasp->txnumevt * active_serializers;
 	else