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. Link: https://lore.kernel.org/r/20210206203656.15959-5-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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