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wifi: handle malloc errors in wifiattach()

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

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

@@ -464,8 +464,14 @@

 	Wifi *wifi;

 	wifi = malloc(sizeof(Wifi));

-	wifi->ether = ether;

+	if(wifi == nil)

+		error(Enomem);

 	wifi->iq = qopen(8*1024, 0, 0, 0);

+	if(wifi->iq == nil){

+		free(wifi);

+		error(Enomem);

+	}

+	wifi->ether = ether;

 	wifi->transmit = transmit;

 	wifi->status = Snone;

-- 

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