ALSA: Constify the snd_pcm_substream struct ops field
The ops field of the snd_pcm_substream struct is never modified inside the ALSA core. Making it const allows drivers to declare their snd_pcm_ops struct as const. Signed-off-by: NLars-Peter Clausen <lars@metafoo.de> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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