ALSA: pcm: Use for_each_pcm_substream() macro

There are a few places doing the same loop iterating all PCM
substreams belonging to the PCM object.  Introduce a local helper
macro, for_each_pcm_substream(), to simplify the code.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 files changed