ASoC: qcom: sm8250: Fix array out of bounds access

Static analysis Coverity had detected a potential array out-of-bounds
write issue due to the fact that MAX AFE port Id was set to 16 instead
of using AFE_PORT_MAX macro.

Fix this by properly using AFE_PORT_MAX macro.

Fixes: aa2e2785 ("ASoC: qcom: sm8250: add sound card qrb5165-rb5 support")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20201028142001.22431-1-srinivas.kandagatla@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/qcom/sm8250.c

@@ -13,12 +13,11 @@
 
 #define DRIVER_NAME		"sm8250"
 #define MI2S_BCLK_RATE		1536000
-#define MAX_SDW_STREAMS		16
 
 struct sm8250_snd_data {
-	bool stream_prepared[MAX_SDW_STREAMS];
+	bool stream_prepared[AFE_PORT_MAX];
 	struct snd_soc_card *card;
-	struct sdw_stream_runtime *sruntime[MAX_SDW_STREAMS];
+	struct sdw_stream_runtime *sruntime[AFE_PORT_MAX];
 };
 
 static int sm8250_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,