xfs: call xfs_buf_alloc_backing_mem from _xfs_buf_alloc
We never allocate a buffer without backing memory. Simplify the call
chain by calling xfs_buf_alloc_backing_mem from _xfs_buf_alloc. To
avoid a forward declaration, move _xfs_buf_alloc down a bit in the
file.
Also drop the pointless _-prefix from _xfs_buf_alloc.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by: Carlos Maiolino <cem@kernel.org>
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