[Refactor] no-render-return-value: reuse version test result

This commit likely fixes the performace issue noted in jsx-eslint#2259.

Author: golopot

lib/rules/no-render-return-value.js

@@ -27,6 +27,15 @@ module.exports = {
     // Public
     // --------------------------------------------------------------------------
 
+    let calleeObjectName = /^ReactDOM$/;
+    if (versionUtil.testReactVersion(context, '15.0.0')) {
+      calleeObjectName = /^ReactDOM$/;
+    } else if (versionUtil.testReactVersion(context, '0.14.0')) {
+      calleeObjectName = /^React(DOM)?$/;
+    } else if (versionUtil.testReactVersion(context, '0.13.0')) {
+      calleeObjectName = /^React$/;
+    }
+
     return {
 
       CallExpression: function(node) {
@@ -36,15 +45,6 @@ module.exports = {
           return;
         }
 
-        let calleeObjectName = /^ReactDOM$/;
-        if (versionUtil.testReactVersion(context, '15.0.0')) {
-          calleeObjectName = /^ReactDOM$/;
-        } else if (versionUtil.testReactVersion(context, '0.14.0')) {
-          calleeObjectName = /^React(DOM)?$/;
-        } else if (versionUtil.testReactVersion(context, '0.13.0')) {
-          calleeObjectName = /^React$/;
-        }
-
         if (
           callee.object.type !== 'Identifier' ||
           !calleeObjectName.test(callee.object.name) ||