ASoC: mediatek: mt8186: remove unnecessary NULL check

The "i2s_priv" pointer cannot be NULL.  Some NULL checks were deleted
in commit d7bffbe9 ("ASoC: mediatek: mt8186: remove unnecessary
judgments") but this one was accidentally left behind.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/Yuo7LGPk8KnBW6ac@kiliSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8186/mt8186-dai-i2s.c

@@ -968,7 +968,7 @@ static int mtk_dai_i2s_config(struct mtk_base_afe *afe,
 	}
 
 	/* set share i2s */
-	if (i2s_priv && i2s_priv->share_i2s_id >= 0) {
+	if (i2s_priv->share_i2s_id >= 0) {
 		ret = mtk_dai_i2s_config(afe, params, i2s_priv->share_i2s_id);
 		if (ret)
 			return ret;