xfs: clean up indentation issues, remove an unwanted space

There is a statement that has an unwanted space in the indentation.
Remove it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>