target: Use array_zalloc for tpg_lun_list
Turns an order-10 allocation into slab-sized ones, thereby preventing allocation failures with memory fragmentation. This likely saves memory as well, as the slab allocator can pack objects more tightly than the buddy allocator. Signed-off-by: NJoern Engel <joern@logfs.org> Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
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