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nusb/kb: increase maximum report descriptor size, non-continuous endpoints (from richard millars usbmouse-endpoint patch)

Another band-aid fix to the usb mouse driver, to cope with a mouse which has
an interrupt endpoint number 3 but no number 1 or 2, and a report descriptor
more than 128 bytes long.

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -39,7 +39,7 @@

 	/* report descriptor */

 	int	nrep;

-	uchar	rep[128];

+	uchar	rep[512];

 };

 /*

@@ -806,7 +806,7 @@

 	ud = d->usb;

 	for(i = 0; i < nelem(ud->ep); i++){

 		if((ep = ud->ep[i]) == nil)

-			break;

+			continue;

 		if(ep->type == Eintr && ep->dir == Ein && ep->iface->csp == KbdCSP)

 			kbstart(d, ep, "/dev/kbin", kbdwork);

 		if(ep->type == Eintr && ep->dir == Ein && ep->iface->csp == PtrCSP)

-- 

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