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boot/net.rc: redirect grep error to /dev/null

Usb ethernet driver does not serve ifstats file,
so avoid this error showing up on the console.

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

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

@@ -1,7 +1,7 @@

 #!/bin/rc

 fn wifi{

-	if(grep -s '^essid: ' $1/ifstats){

+	if(grep -s '^essid: ' $1/ifstats >[2]/dev/null){

 		if(~ $#essid 0)

 			essid=`{grep '^essid: ' $1/ifstats >[2]/dev/null | sed 's/^essid: //; q'}

 		if(! ~ $#essid 0){

-- 

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