xfs: convert buf_cancel_table allocation to kmalloc_array
While we're messing around with how recovery allocates and frees the buffer cancellation table, convert the allocation to use kmalloc_array instead of the old kmem_alloc APIs, and make it handle a null return, even though that's not likely. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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