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ethermultilink: ignore link-status of primary

when link-status on secondary is lost, always switch
back to the primary regardless of if it has a link.

this works around some ethernet driver not setting
link-status consistently and wifi's that might
only indicate a link when connected to an ap.

--- a/rc/bin/ethermultilink

+++ b/rc/bin/ethermultilink

@@ -25,6 +25,7 @@

 # first interface is the primary

 primary=$1

+shift

 net=`{echo $primary | sed 's!/*[^/]*$!!g'}

 test -r $net/arp || missing $net/arp

@@ -32,9 +33,9 @@

 # now select secondary from the list depending on link status

 @{

 old=/dev/null

-new=$old

 while(){

 	# interfaces are in increasing priority order

+	new=$primary

 	for(i){

 		if(grep -s 'link: 1' $i/stats)

 			new=$i