Apply suggestions from code review

Co-authored-by: Athan <kgryte@gmail.com>
Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/ssort/test/fixtures/num2str.js

@@ -20,7 +20,7 @@
 
 // MODULES //
 
-var isNegativeZero = require( '@stdlib/math/base/assert/is-negative-zero' );
+var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );
 
 
 // MAIN //
@@ -33,7 +33,7 @@ var isNegativeZero = require( '@stdlib/math/base/assert/is-negative-zero' );
 * @returns {string} string representation
 */
 function num2str( value ) {
-	if ( isNegativeZero( value ) ) {
+	if ( isNegativeZerof( value ) ) {
 		return '-0';
 	}
 	return value.toString();