ASoC: soc-core: Use IS_ERR_OR_NULL()

The check of IS_ERR or NULL pointer can be replaced by IS_ERR_OR_NULL(),
which helps readability.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -495,7 +495,7 @@ static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
 static void snd_soc_debugfs_init(void)
 {
 	snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);
-	if (IS_ERR(snd_soc_debugfs_root) || !snd_soc_debugfs_root) {
+	if (IS_ERR_OR_NULL(snd_soc_debugfs_root)) {
 		pr_warn("ASoC: Failed to create debugfs directory\n");
 		snd_soc_debugfs_root = NULL;
 		return;