Trivial cosmetic unimportant issue (urgent)

["Sean" <seanlkml@xxxxxxxxxx>]

Hi folks,

      Just a few days uptime and sysfs is reporting that i've transfered a 
_negative_ number of bytes!  Any chance this could be
unsigned output instead?    The display is created in a common 
net_device_stat_show but none of the others values should go negative
either.

Cheers,
Sean