Fix sparse warning introduced by commit 4ef897a2 ("xfs: flush both
inodes in xfs_swap_extents").
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NDave Chinner <david@fromorbit.com>