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nusb/ether: rndis: add standard class code (tested by jmi2k with OnePlus 8)

--- a/sys/src/cmd/nusb/ether/rndis.c

+++ b/sys/src/cmd/nusb/ether/rndis.c

@@ -112,6 +112,7 @@

 {

 	uchar res[128];

 	int r, i, off, sz;

+	ulong csp;

 	Ep *ep;

 	r = 0;

@@ -118,8 +119,9 @@

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

 		if((ep = d->usb->ep[i]) == nil)

 			continue;

+		csp = ep->iface->csp;

 		// ff0202 is canonical CSP per Linux kernel; 301e0 used by Nexus 5

-		if(ep->iface->csp == 0xff0202 || ep->iface->csp == 0x000301e0)

+		if(csp == 0xff0202 || csp == 0x0301e0 || csp == 0x0104ef)

 			r = 1;

 	}

 	if(!r){