refactor: apply suggestions from code review

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Author: headlessNode

lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/lib/main.js

@@ -26,11 +26,11 @@ var rule;
 // FUNCTIONS //
 
 /**
-* Checks whether using the built-in BigInt or `@stdlib/bigint/ctor`.
+* Checks whether using imported constructor from `@stdlib/bigint/ctor`.
 *
 * @private
 * @param {Object} scope - scope
-* @returns {boolean} boolean indicating if using the built-in BigInt or `@stdlib/bigint/ctor`
+* @returns {boolean} boolean indicating if using imported constructor from `@stdlib/bigint/ctor`
 */
 function isImportedBigInt( scope ) {
 	var isNotBuiltIn;
@@ -60,9 +60,7 @@ function isImportedBigInt( scope ) {
 * @returns {Object} validators
 */
 function main( context ) {
-	var scope;
-
-	scope = context.getScope();
+	var scope = context.getScope();
 
 	/**
 	* Reports the error message.