make eslint happier

lib/infobox/link.js

@@ -1,13 +1,13 @@
 define(function () {
   return function (config, el, router, d) {
     var h2 = document.createElement("h2")
-    a1 = document.createElement("a")
+    var a1 = document.createElement("a")
     a1.href = "#"
     a1.onclick = router.node(d.source.node)
     a1.textContent = d.source.node.nodeinfo.hostname
     h2.appendChild(a1)
     h2.appendChild(document.createTextNode(" – "))
-    a2 = document.createElement("a")
+    var a2 = document.createElement("a")
     a2.href = "#"
     a2.onclick = router.node(d.target.node)
     a2.textContent = d.target.node.nodeinfo.hostname