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devusb: fix debug ctl nil crash

--- a/sys/src/9/port/devusb.c

+++ b/sys/src/9/port/devusb.c

@@ -1347,7 +1347,8 @@

 		print("usb: debug %d\n", debug);

 		for(i = 0; i < epmax; i++)

 			if((ep = getep(i)) != nil){

-				ep->hp->debug(ep->hp, debug);

+				if(ep->hp->debug != nil)

+					ep->hp->debug(ep->hp, debug);

 				putep(ep);

 			}

 		break;