Apply suggestions from code review

Signed-off-by: Gunj Joshi <gunjjoshi8372@gmail.com>

Author: gunjjoshi

lib/node_modules/@stdlib/math/base/special/exp2f/benchmark/benchmark.native.js

@@ -30,9 +30,9 @@ var pkg = require( './../package.json' ).name;
 
 // VARIABLES //
 
-var exp2 = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var exp2f = tryRequire( resolve( __dirname, './../lib/native.js' ) );
 var opts = {
-	'skip': ( exp2 instanceof Error )
+	'skip': ( exp2f instanceof Error )
 };
 
 
@@ -49,13 +49,13 @@ bench( pkg+'::native', opts, function benchmark( b ) {
 
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		y = exp2( x[ i%x.length ] );
-		if ( isnan( y ) ) {
+		y = exp2f( x[ i%x.length ] );
+		if ( isnanf( y ) ) {
 			b.fail( 'should not return NaN' );
 		}
 	}
 	b.toc();
-	if ( isnan( y ) ) {
+	if ( isnanf( y ) ) {
 		b.fail( 'should not return NaN' );
 	}
 	b.pass( 'benchmark finished' );