usb/142876: sysinstall abort:: usb stick as source media & usb stick as install target

[Fbsd1]

>>
> 
> Hi,
> 
> I understand that. The problem I see it is that /dev/daX is used as mount 
> device instead of the disk label, for example /dev/ufs/FreeBSD-8-installer. 
> Then the device name does not matter. This is not an USB problem. Your PR is 
> misplaced.
> 
> --HPS
> 
> 

So change the PR "Category = usb" to I386 or software or what ever 
category the sysinstall program would be under.