kfifo_alloc tries to round up the buffer size to the next power of two.

But it accidently uses the original size when calling kfifo_init,
which will BUG.
Acked-by: Stelian Pop <stelian@popies.net>
Signed-off-by: Martin Waitz <tali@admingilde.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>