ASoC: max98373: Add checks for devm_kcalloc

As the devm_kcalloc may return NULL pointer,
it should be better to check the return value
in order to avoid NULL poineter dereference.

Fixes: 349dd23 ("ASoC: max98373: don't access volatile registers in bias level off")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20221116082508.17418-1-jiasheng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: JiangJias

sound/soc/codecs/max98373-i2c.c

@@ -549,6 +549,10 @@ static int max98373_i2c_probe(struct i2c_client *i2c)
 	max98373->cache = devm_kcalloc(&i2c->dev, max98373->cache_num,
 				       sizeof(*max98373->cache),
 				       GFP_KERNEL);
+	if (!max98373->cache) {
+		ret = -ENOMEM;
+		return ret;
+	}
 
 	for (i = 0; i < max98373->cache_num; i++)
 		max98373->cache[i].reg = max98373_i2c_cache_reg[i];