ALSA: wavefront: Use guard() for spin locks

ALSA: wavefront: Use guard() for spin locks

[ Upstream commit 4b97f8e614ba46a50bd181d40b5a1424411a211a ]

Clean up the code using guard() for spin locks.

Merely code refactoring, and no behavior change.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250829145300.5460-19-tiwai@suse.de
Stable-dep-of: e11c5c13ce0a ("ALSA: wavefront: Clear substream pointers on close")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>