intel: ssp: fix missing return code on bclk configuration issue

when the bclk is not based on the default source, we will thrown an
error message but return the result of the mclk configuration.

Fix by adding an explicit -EINVAL return value.

Reported-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>

Author: plbossart

src/drivers/intel/ssp/ssp.c

@@ -657,6 +657,7 @@ static int ssp_pre_start(struct dai *dai)
 	if (ssp_freq[SSP_DEFAULT_IDX].freq % config->ssp.bclk_rate != 0) {
 		dai_err(dai, "invalid bclk_rate = %d for dai_index = %d",
 			config->ssp.bclk_rate, config->dai_index);
+		ret = -EINVAL;
 		goto out;
 	}