fix linting errors

lib/6to5/transformation/transformers/other/use-strict.js

@@ -16,6 +16,6 @@ exports.FunctionExpression = function (node, parent, scope, context) {
   context.skip();
 };
 
-exports.ThisExpression = function (node, parent, scope, context, file) {
+exports.ThisExpression = function () {
   return t.identifier("undefined");
 };

lib/6to5/types/index.js

@@ -447,7 +447,7 @@ t.buildMatchMemberExpression = function (match, allowPartial) {
 
       // too many parts
       if (++i > parts.length) {
-        if (partial) {
+        if (allowPartial) {
           return true;
         } else {
           return false;