ASoC: cs53l30: Fix a bug for TDM slot location validation

The maximum slot number of CS53L30 is 4 while it should support
the situation that's less than 4 channels based on the rx_mask.

So when the driver validates the last slot location, it should
check the last active slot instead of always the 4th one.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs53l30.c

@@ -809,8 +809,8 @@ static int cs53l30_set_dai_tdm_slot(struct snd_soc_dai *dai,
 		return -EINVAL;
 	}
 
-	/* Validate the last CS53L30 slot */
-	slot_next = loc[CS53L30_TDM_SLOT_MAX - 1] + slot_step - 1;
+	/* Validate the last active CS53L30 slot */
+	slot_next = loc[i - 1] + slot_step - 1;
 	if (slot_next > 47) {
 		dev_err(dai->dev, "slot selection out of bounds: %u\n",
 			slot_next);