block: Use dma_zalloc_coherent
Use the zeroing function instead of dma_alloc_coherent & memset(,0,) Signed-off-by: NJoe Perches <joe@perches.com> Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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