ALSA: hda - Remove superfluous pcm NULL check

The variable pcm can be never NULL since it was rewritten with
list_for_each_entry().
Suggested-by: Markus Osterhoff <linux-kernel@k-raum.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -3102,8 +3102,7 @@ static int add_std_chmaps(struct hda_codec *codec)
 			struct snd_pcm_chmap *chmap;
 			const struct snd_pcm_chmap_elem *elem;
 
-			if (!pcm || !pcm->pcm || pcm->own_chmap ||
-			    !hinfo->substreams)
+			if (!pcm->pcm || pcm->own_chmap || !hinfo->substreams)
 				continue;
 			elem = hinfo->chmap ? hinfo->chmap : snd_pcm_std_chmaps;
 			err = snd_pcm_add_chmap_ctls(pcm->pcm, str, elem,