bench: fix buffer size

Author: kgryte

lib/node_modules/@stdlib/ndarray/offset/benchmark/benchmark.js

@@ -35,7 +35,7 @@ bench( pkg, function benchmark( b ) {
 	var n;
 	var i;
 
-	buf = zeros( 10000 );
+	buf = zeros( 20000 );
 
 	values = [
 		ndarray( 'generic', buf, [ 10, 10, 10, 1 ], [ 1000, 100, 10, 1 ], 100, 'row-major' ),