ALSA: hda/hdmi: Remove some dead code

These snd_BUG_ON() can never trigger, so just remove them to save a few
LoC.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/91a31341f32d493bcc6c4515178ce0755ac1aa70.1681710069.git.christophe.jaillet@wanadoo.frSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_hdmi.c

@@ -2093,10 +2093,6 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 		goto unlock;
 	}
 
-	if (snd_BUG_ON(pin_idx < 0)) {
-		err = -EINVAL;
-		goto unlock;
-	}
 	per_pin = get_pin(spec, pin_idx);
 
 	/* Verify pin:cvt selections to avoid silent audio after S3.
@@ -2188,13 +2184,13 @@ static int hdmi_pcm_close(struct hda_pcm_stream *hinfo,
 		snd_hda_spdif_ctls_unassign(codec, pcm_idx);
 		clear_bit(pcm_idx, &spec->pcm_in_use);
 		pin_idx = hinfo_to_pin_index(codec, hinfo);
+		/*
+		 * In such a case, return 0 to match the behavior in
+		 * hdmi_pcm_open()
+		 */
 		if (pin_idx < 0)
 			goto unlock;
 
-		if (snd_BUG_ON(pin_idx < 0)) {
-			err = -EINVAL;
-			goto unlock;
-		}
 		per_pin = get_pin(spec, pin_idx);
 
 		if (spec->dyn_pin_out) {