feat: fixed breaking test

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Author: rohraharjas

lib/node_modules/@stdlib/stats/incr/nanskewness/test/test.js

@@ -131,6 +131,7 @@ tape( 'if provided a `NaN`, the accumulator function ignores the `NaN` and retur
 	var i;
 
 	data = [ NaN, 2.0, 1.0, -2.0, -3.0, 4.0, 5.0, 6.0, 7.0 ];
+	acc = incrnanskewness();
 	for ( i = 0; i < data.length; i++ ) {
 		v = acc( data[ i ] );
 		if ( isnan( data[i] ) ) {