ASoC: rt5645: fix a NULL pointer dereference

devm_kcalloc() may fail and return NULL. The fix returns ENOMEM
in case it fails to avoid NULL pointer dereference.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5645.c

@@ -3419,6 +3419,9 @@ static int rt5645_probe(struct snd_soc_component *component)
 		RT5645_HWEQ_NUM, sizeof(struct rt5645_eq_param_s),
 		GFP_KERNEL);
 
+	if (!rt5645->eq_param)
+		return -ENOMEM;
+
 	return 0;
 }