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etheriwl: provide shutdown function

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

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

@@ -2240,6 +2240,17 @@

 	iunlock(ctlr);

 }

+static void

+iwlshutdown(Ether *edev)

+{

+	Ctlr *ctlr;

+

+	ctlr = edev->ctlr;

+	if(ctlr->power)

+		poweroff(ctlr);

+	ctlr->broken = 0;

+}

+

 static Ctlr *iwlhead, *iwltail;

 static void

@@ -2345,6 +2356,7 @@

 	edev->attach = iwlattach;

 	edev->ifstat = iwlifstat;

 	edev->ctl = iwlctl;

+	edev->shutdown = iwlshutdown;

 	edev->promiscuous = iwlpromiscuous;

 	edev->multicast = nil;

 	edev->mbps = 10;