ASoC: mediatek: mt8365: check validity before usage of i2s_data

There may be a case where i2s_data may not get initialized by the for
loop which will cause the kernel crash. Initialize the i2s_data to NULL
and abort execute if it isn't found.

Fixes: 402bbb1 ("ASoC: mediatek: mt8365: Add I2S DAI support")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20240911111317.4072349-1-usama.anjum@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Muhammad Usama Anjum

sound/soc/mediatek/mt8365/mt8365-dai-i2s.c

@@ -465,13 +465,16 @@ void mt8365_afe_set_i2s_out_enable(struct mtk_base_afe *afe, bool enable)
 	int i;
 	unsigned long flags;
 	struct mt8365_afe_private *afe_priv = afe->platform_priv;
-	struct mtk_afe_i2s_priv *i2s_data;
+	struct mtk_afe_i2s_priv *i2s_data = NULL;
 
 	for (i = 0; i < DAI_I2S_NUM; i++) {
 		if (mt8365_i2s_priv[i].adda_link)
 			i2s_data = afe_priv->dai_priv[mt8365_i2s_priv[i].id];
 	}
 
+	if (!i2s_data)
+		return;
+
 	spin_lock_irqsave(&afe_priv->afe_ctrl_lock, flags);
 
 	if (enable) {