ALSA: oss: remove useless NULL check before kfree

Tis patch try to remove useless NULL check before kfree

Signed-off-by: Bernard Zhao <bernard@vivo.com>
Link: https://lore.kernel.org/r/20211206014135.320720-1-bernard@vivo.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: Bernard Zhao

sound/core/info_oss.c

@@ -32,10 +32,8 @@ int snd_oss_info_register(int dev, int num, char *string)
 	mutex_lock(&strings);
 	if (string == NULL) {
 		x = snd_sndstat_strings[num][dev];
-		if (x) {
-			kfree(x);
-			x = NULL;
-		}
+		kfree(x);
+		x = NULL;
 	} else {
 		x = kstrdup(string, GFP_KERNEL);
 		if (x == NULL) {