xfs: clear BAD_SUMMARY if unmounting an unhealthy filesystem

If we know the filesystem metadata isn't healthy during unmount, we want
to encourage the administrator to run xfs_repair right away.  We can't
do this if BAD_SUMMARY will cause an unclean log unmount to force
summary recalculation, so turn it off if the fs is bad.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Brian Foster <[email protected]>

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