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boot: dont print errors if ethernet has no ifstats file, can happen with usb ethernet

--- a/sys/src/9/boot/net.rc

+++ b/sys/src/9/boot/net.rc

@@ -10,7 +10,7 @@

 	# setup wifi encryption if any

 	if(~ $1 ether && ~ $service terminal && test -x /bin/aux/wpa){

-		if(grep -s '^status: need authentication' $2/ifstats){

+		if(grep -s '^status: need authentication' $2/ifstats >[2]/dev/null){

 			aux/wpa -p $2

 		}

 	}

-- 

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