protocol: don't cast a uint32 to an int and expect a positive num
protocol: don't cast a uint32 to an int and expect a positive num

That doesn't work on 32-bit machines.

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client