sound/oss/dmasound: fix 'dmasound_setup' defined but not used

We observed: 'dmasound_setup' defined but not used error with
COMPILER=gcc ARCH=m68k DEFCONFIG=allmodconfig build.

Fix it by adding __maybe_unused to dmasound_setup.

Error(s):
sound/oss/dmasound/dmasound_core.c:1431:12: error: 'dmasound_setup' defined but not used [-Werror=unused-function]

Fixes: 9dd7c46 ("sound/oss/dmasound: fix build when drivers are mixed =y/=m")
Signed-off-by: Miles Chen <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

sound/oss/dmasound/dmasound_core.c

@@ -1428,7 +1428,7 @@ void dmasound_deinit(void)
 		unregister_sound_dsp(sq_unit);
 }
 
-static int dmasound_setup(char *str)
+static int __maybe_unused dmasound_setup(char *str)
 {
 	int ints[6], size;