- fix compile warning about checking that an unsigned int was >= 0
- fix compile warning about checking that an unsigned int was >= 0

dariaphoebe/bochs,dbrashear/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dbrashear/bochs,dbrashear/bochs