xfs: convert remaining xfs_sb_version_... checks to bool

Some were missed in the pass that converted the function return
values from int to bool. Update the remaining ones for consistency.

Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>