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Several ALSA paths acquire temporary card references with snd_card_ref() and release them manually with snd_card_unref(). control_led.c already defines a local cleanup helper for this pattern, while other core paths still open-code the release. Move the helper to the common ALSA core header and use it in control-layer card-reference paths. This makes the ownership rule explicit and avoids future missing-unref mistakes when adding early exits. No functional change is intended. Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://patch.msgid.link/20260604-alsa-scoped-cleanups-v1-2-10c43152a728@gmail.com