ALSA: pcm: Call snd_card_unref() inside in_pcm_file()

The snd_card_unref() call in snd_pcm_link() looks suspicious through a
quick glance, but it's a correct usage; this is needed just because
the file descriptor check in is_pcm_file() calls the helper
snd_lookup_minor_data() that keeps the card refcount.

Despite of the correctness, the code still looks confusing.
Basically, keeping the card ref for the whole code isn't needed
as fdget() blocks the release of the opened file.  Hence it's more
understandable if snd_card_unref() is moved into is_pcm_file(), then
the caller doesn't have to take care after the call.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/pcm_native.c

@@ -1935,13 +1935,19 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream)
 static bool is_pcm_file(struct file *file)
 {
 	struct inode *inode = file_inode(file);
+	struct snd_pcm *pcm;
 	unsigned int minor;
 
 	if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
 		return false;
 	minor = iminor(inode);
-	return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
-		snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
+	pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
+	if (!pcm)
+		pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
+	if (!pcm)
+		return false;
+	snd_card_unref(pcm->card);
+	return true;
 }
 
 /*
@@ -1996,7 +2002,6 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
 	write_unlock_irq(&snd_pcm_link_rwlock);
 	up_write(&snd_pcm_link_rwsem);
  _nolock:
-	snd_card_unref(substream1->pcm->card);
 	kfree(group);
  _badf:
 	fdput(f);