[ Upstream commit fc93c96fe34e10b873fef73e80cee52503f3a679 ] snd_compress_register() and snd_compress_deregister() API functions have been never used by in-tree drivers. Let's clean up the dead code. Acked-by: Vinod Koul <vkoul@kernel.org> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Link: https://lore.kernel.org/r/20210714162424.4412-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de> Stable-dep-of: 796e119e9b14 ("ALSA: core: Validate compress device numbers without dynamic minors") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Ulrich Hecht <uli@kernel.org>