ALSA: use __devexit_p

Change __devexit to __devexit_p:
sound/isa/opl3sa2.c:956: error: expected expression before '__attribute__'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Jaroslav Kysela <perex@suse.cz>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>