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iwl: add "reset" ctl message to software tigger device reset

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

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

@@ -1956,6 +1956,10 @@

 	Ctlr *ctlr;

 	ctlr = edev->ctlr;

+	if(n >= 5 && memcmp(buf, "reset", 5) == 0){

+		ctlr->broken = 1;

+		return n;

+	}

 	if(ctlr->wifi)

 		return wifictl(ctlr->wifi, buf, n);

 	return 0;