nusb/kb: zero reads, error handling, priority, cleanup

handle short reads as errors and retry. this can happen
on ohci and some ps2 to usb converter. it might'v deen caused
by a recent change on sources handling td overrun differently.

fix error handling. have to check f->ep == nil after recovery
and check packet size. also, use f->ep->dfd instead of ptrfd
and kbdfd as it might be different after recovery. make a
setleds() error non fatal.

boost process priority for keyboard and mouse worker processes.

cleanup: use single write() in putmod(), improve error reporting.

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