sound/oss/dmasound: fix build when drivers are mixed =y/=m

stable inclusion
from stable-v5.10.180
commit be649ea153b04c2ad35c6f32b18f644ab9b192b9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8DDFN

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=be649ea153b04c2ad35c6f32b18f644ab9b192b9



--------------------------------

commit 9dd7c463 upstream.

When CONFIG_DMASOUND_ATARI=m and CONFIG_DMASOUND_Q40=y (or vice versa),
dmasound_core.o can be built without dmasound_deinit() being defined,
causing a build error:

ERROR: modpost: "dmasound_deinit" [sound/oss/dmasound/dmasound_atari.ko] undefined!

Modify dmasound_core.c and dmasound.h so that dmasound_deinit() is
always available.

The mixed modes (=y/=m) also mean that several variables and structs
have to be declared in all cases.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Link: lore.kernel.org/r/202204032138.EFT9qGEd-lkp@intel.com
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Link: https://lore.kernel.org/r/20220405234118.24830-1-rdunlap@infradead.org


Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>