ALSA: sb: Drop NULL check for snd_ctl_remove()

Since snd_ctl_remove() accepts the NULL kcontrol argument now, we can
drop the check in the caller side.

Link: https://lore.kernel.org/20240617100529.6667-3-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/sb/emu8000.c

@@ -1039,10 +1039,8 @@ snd_emu8000_create_mixer(struct snd_card *card, struct snd_emu8000 *emu)
 	return 0;
 
 __error:
-	for (i = 0; i < EMU8000_NUM_CONTROLS; i++) {
-		if (emu->controls[i])
-			snd_ctl_remove(card, emu->controls[i]);
-	}
+	for (i = 0; i < EMU8000_NUM_CONTROLS; i++)
+		snd_ctl_remove(card, emu->controls[i]);
 	return err;
 }
 

sound/isa/sb/sb16_csp.c

@@ -1080,14 +1080,10 @@ static void snd_sb_qsound_destroy(struct snd_sb_csp * p)
 
 	card = p->chip->card;	
 	
-	if (p->qsound_switch) {
-		snd_ctl_remove(card, p->qsound_switch);
-		p->qsound_switch = NULL;
-	}
-	if (p->qsound_space) {
-		snd_ctl_remove(card, p->qsound_space);
-		p->qsound_space = NULL;
-	}
+	snd_ctl_remove(card, p->qsound_switch);
+	p->qsound_switch = NULL;
+	snd_ctl_remove(card, p->qsound_space);
+	p->qsound_space = NULL;
 
 	/* cancel pending transfer of QSound parameters */
 	spin_lock_irqsave (&p->q_lock, flags);