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nusb/kb: dont set boot protocol on HidCSP interface when we failed to read report descriptor (thanks aap_)

this fixes wireless keyboard/mouse on raspi.

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

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

@@ -304,7 +304,6 @@

 	int id, proto;

 	Iface *iface;

-	proto = Bootproto;

 	iface = f->dev->usb->ep[eid]->iface;

 	id = iface->id;

 	f->nrep = usbcmd(f->dev, Rd2h|Rstd|Riface, Rgetdesc, Dreport<<8, id, 

@@ -323,13 +322,20 @@

 		}

 		proto = Reportproto;

 	} else {

-		if(iface->csp == KbdCSP){

+		switch(iface->csp){

+		case KbdCSP:

 			f->nrep = sizeof(kbdbootrep);

 			memmove(f->rep, kbdbootrep, f->nrep);

-		} else {

+			break;

+		case PtrCSP:

 			f->nrep = sizeof(ptrbootrep);

 			memmove(f->rep, ptrbootrep, f->nrep);

+			break;

+		default:

+			werrstr("no report descriptor");

+			return -1;

 		}

+		proto = Bootproto;

 	}

 	return usbcmd(f->dev, Rh2d|Rclass|Riface, Setproto, proto, id, nil, 0);

 }

-- 

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