block: Convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...)

Use the helper function instead of __GFP_ZERO.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --cc block/cfq-iosched.c
Simple merge

diff --cc block/deadline-iosched.c
Simple merge

diff --cc block/elevator.c
Simple merge

diff --cc block/genhd.c
Simple merge