[PATCH] uniput - fix crash on SMP

Only signal completion after marking request slot as free, otherwise other
processor can free request structure before we finish using it.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>