LU-9679 osd: use OBD_ALLOC_PTR_ARRAY() and others

LU-9679 osd: use OBD_ALLOC_PTR_ARRAY() and others

Use:
  OBD_ALLOC_PTR_ARRAY
  OBD_FREE_PTR_ARRAY
  OBD_ALLOC_PTR_ARRAY_LARGE
  OBD_FREE_PTR_ARRAY_LARGE

for allocating and freeing arrays in osd-ldiskfs and osd-zfs.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: Iec2ec54e0b87aeefb42d5b4ab802c564850f6edd
Reviewed-on: https://review.whamcloud.com/38252
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>