ASoC: tas2781: Fix error code in tas2781_load_calibration()

Return -EINVAL instead of success on this error path.

Fixes: 915f5ead ("ASoC: tas2781: firmware lib")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/Message-Id: <729bb6b3-bc1d-4b3d-8b65-077a492c753c@moroto.mountain>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tas2781-fmwlib.c

@@ -1924,6 +1924,7 @@ int tas2781_load_calibration(void *context, char *file_name,
 	if (!fw_entry->size) {
 		dev_err(tas_priv->dev, "%s: file read error: size = %lu\n",
 			__func__, (unsigned long)fw_entry->size);
+		ret = -EINVAL;
 		goto out;
 	}
 	fmw.size = fw_entry->size;