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.

Reference: /n/sources/patch/applied/usbmouse-endpoint
Date: Wed Jan 30 11:44:42 CET 2013
Signed-off-by: miller@hamnavoe.com

--- /sys/src/cmd/usb/kb/kb.c	Wed Jan 30 11:42:53 2013
+++ /sys/src/cmd/usb/kb/kb.c	Wed Jan 30 11:42:50 2013
@@ -619,7 +619,7 @@
 static void
 kbstart(Dev *d, Ep *ep, Kin *in, void (*f)(void*), KDev *kd)
 {
-	uchar desc[128];
+	uchar desc[512];
 	int n, res;
 
 	qlock(&inlck);
@@ -739,7 +739,7 @@
 
 	for(i = 0; i < nelem(ud->ep); i++){
 		if((ep = ud->ep[i]) == nil)
-			break;
+			continue;
 		if(kena && ep->type == Eintr && ep->dir == Ein &&
 		    ep->iface->csp == KbdCSP){
 			kd = d->aux = emallocz(sizeof(KDev), 1);