[PATCH (trivial)] xfs_db: remove "-f" option from freesp usage()

[Christoph Hellwig]

On Wed, Jul 29, 2009 at 09:27:54AM -0500, Eric Sandeen wrote:
> the freesp doesn't support "-f" so take it out of the usage().
> 
> The manpage is fine; usage() is the only reference to "-f"

Looks good.

Reviewed-by: Christoph Hellwig <hch at lst.de>