ALSA: opl3: Delete an error message for a failed memory allocation in snd_opl3_new()

Omit an extra message for a memory allocation failure in this function.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/opl3/opl3_lib.c

@@ -355,10 +355,8 @@ int snd_opl3_new(struct snd_card *card,
 
 	*ropl3 = NULL;
 	opl3 = kzalloc(sizeof(*opl3), GFP_KERNEL);
-	if (opl3 == NULL) {
-		snd_printk(KERN_ERR "opl3: cannot allocate\n");
+	if (!opl3)
 		return -ENOMEM;
-	}
 
 	opl3->card = card;
 	opl3->hardware = hardware;