net/mwan3: remove unused local variables

Remove unused local variables

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/mwan3/files/lib/mwan3/mwan3.sh

@@ -58,7 +58,7 @@ mwan3_id2mask()
 mwan3_init()
 {
 	local bitcnt
-	local mmdefault mmblackhole mmunreachable
+	local mmdefault
 
 	[ -d $MWAN3_STATUS_DIR ] || mkdir -p $MWAN3_STATUS_DIR/iface_state