block: collapse blk_alloc_request() into get_request()
Allocation failure handling in get_request() is about to be updated. To ease the update, collapse blk_alloc_request() into get_request(). This patch doesn't introduce any functional change. Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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