ASoC: stm32: sai: fix invalid use of sizeof in stm32_sai_add_mclk_provider()

sizeof() when applied to a pointer typed expression gives the
size of the pointer, not that of the pointed data.

Fixes: 8307b2af ("ASoC: stm32: sai: set sai as mclk clock provider")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/stm/stm32_sai_sub.c

@@ -389,7 +389,7 @@ static int stm32_sai_add_mclk_provider(struct stm32_sai_sub_data *sai)
 	char *mclk_name, *p, *s = (char *)pname;
 	int ret, i = 0;
 
-	mclk = devm_kzalloc(dev, sizeof(mclk), GFP_KERNEL);
+	mclk = devm_kzalloc(dev, sizeof(*mclk), GFP_KERNEL);
 	if (!mclk)
 		return -ENOMEM;