xfs: remove shared supberlock feature checking
We reject any filesystem that is mounted with this feature bit set, so we don't need to check for it anywhere else. Remove the function for checking if the feature bit is set and any code that uses it. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NJie Liu <jeff.liu@oracle.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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