block: switch numa_node to int in blk_mq_hw_ctx and init_request

block: switch numa_node to int in blk_mq_hw_ctx and init_request

numa_node in blk_mq_hw_ctx and the matching argument of
blk_mq_ops::init_request can be NUMA_NO_NODE (-1).  Declared as
unsigned int, NUMA_NO_NODE becomes UINT_MAX and walks off
nvme_dev::descriptor_pools[] on CONFIG_NUMA=n [1].

Switch the field and the callback prototype to int and update all
in-tree init_request implementations.  No functional change:
cpu_to_node(), kmalloc_node() and blk_alloc_flush_queue() already
take int.

Link: https://lore.kernel.org/linux-nvme/20260522150628.399288-1-mateusz.nowicki@posteo.net/
Link: https://lore.kernel.org/linux-nvme/20260309062840.2937858-2-iam@sung-woo.kim/
Suggested-by: Caleb Sander Mateos <csander@purestorage.com>
Suggested-by: Sung-woo Kim <iam@sung-woo.kim>
Signed-off-by: Mateusz Nowicki <mateusz.nowicki@posteo.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260523125210.272274-1-mateusz.nowicki@posteo.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>