The comparison with ZERO_SIZE_PTR in ZERO_OR_NULL_PTR() needs to be <=
(not just <) so that ZERO_OR_NULL_PTR(ZERO_SIZE_PTR) is 1.
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
[ Duh!  - Linus ]
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>