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.

rc/bin/ethermultilink

@@ -25,6 +25,7 @@ for(i){
 
 # 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 @@ test -r $net/arp || missing $net/arp
 # now select secondary from the list depending on link status
 @{
 old=/dev/null
-new=$old
 while(){
 	# interfaces are in increasing priority order
+	new=$primary
 	for(i){
 		if(grep -s 'link: 1' $i/stats)
 			new=$i