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etheriwl: check RF-Kill switch on attach

--- a/sys/src/9/pc/etheriwl.c

+++ b/sys/src/9/pc/etheriwl.c

@@ -1309,6 +1309,11 @@

 		nexterror();

 	}

 	if(ctlr->attached == 0){

+		if((csr32r(ctlr, Gpc) & RfKill) == 0){

+			print("#l%d: wifi disabled by switch\n", edev->ctlrno);

+			error("wifi disabled by switch");

+		}

+

 		if(ctlr->wifi == nil)

 			ctlr->wifi = wifiattach(edev, transmit);

-- 

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