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9/boot/net.rc: suppress error from grep if ethernet ifstats file is not found

this can happen with nusb/ether, which does not implement ifstats file.

--- 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 && test -x /bin/aux/wpa){

-		essid=`{grep '^essid: ' $2/ifstats | sed 's/^essid: //; q'}

+		essid=`{grep '^essid: ' $2/ifstats >[2]/dev/null | sed 's/^essid: //; q'}

 		if(! ~ $#essid 0){

 			if(! ~ $#wpapsk 0 || grep -s '^status: need authentication' $2/ifstats >[2]/dev/null){

 				x=(aux/wpa -s $"essid)

-- 

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