Small change for mkfs.xfs?

[Justin Piszcz]

Hi,

# mkfs.xfs /dev/md0
mkfs.xfs: /dev/md0 appears to contain an existing filesystem (ext3).
mkfs.xfs: Use the -f option to force overwrite.

This occurs if the filesystem is ext4.  Need to differentiate between the 
two FS if possible?

Justin.