chore: update benchmark.js

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---
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Author: saurabhraghuvanshii

lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/benchmark/benchmark.js

@@ -41,6 +41,7 @@ bench( pkg, function benchmark( b ) {
 	var i;
 
 	len = 100;
+	x = new Float64Array( len );
 	mu = new Float64Array( len );
 	sigma = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {