fixed ndarray.js ESLint issue

Author: gkbishnoi07

lib/node_modules/@stdlib/stats/base/variancewd/lib/ndarray.js

@@ -23,6 +23,7 @@
 var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
 var accessors = require( './accessors.js' );
 
+
 // MAIN //
 
 /**
@@ -80,15 +81,11 @@ var accessors = require( './accessors.js' );
 * @returns {number} variance
 */
 function variancewd(N, correction, x, strideX, offsetX) {
-	var offsetX;
-	var strideX;
 	var delta2;
 	var delta;
-	var correction;
 	var M2;
 	var mu;
 	var ix;
-	var N;
 	var v;
 	var n;
 	var o;