ALSA: hda - Don't access invalid substream in proc file
The commit e3303235 "ALSA: hda - proc - show which I/O NID is associated to PCM device" introduces the access to substream pointer. But, PCMs may have no substreams in one or both directions, and this results in NULL dereference. Also, print the first substream number doesn't make sense. This patch removes the access to the substream pointer, and reformat to fit to the standard coding style. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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