xfs: remove dead inode version setting code

We can only get into the branch if CRCs are enabled, so there's no
need to check inside the branch for CRCs being enabled....

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>