xfs: remove XFS_BUF_ZEROFLAGS macro
The places where we use this macro already clear unnecessary IO flags (e.g. through xfs_bwrite()) or never have unexpected IO flags set on them in the first place (e.g. iclog buffers). Remove the macro from these locations, and where necessary clear only the specific flags that are conditional in the current buffer context. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NDave Chinner <david@fromorbit.com>
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