chore: use isnanf instead of isnan

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
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    status: passed
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    status: passed
---

Author: officiallyanee

lib/node_modules/@stdlib/math/base/special/erff/lib/main.js

@@ -37,7 +37,7 @@
 // MODULES //
 
 var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var exp = require( '@stdlib/math/base/special/exp' );
 var PINF = require( '@stdlib/constants/float32/pinf' );
 var NINF = require( '@stdlib/constants/float32/ninf' );
@@ -133,7 +133,7 @@ function erff( x ) {
 	var q;
 
 	// Special case: NaN
-	if ( isnan( x ) ) {
+	if ( isnanf( x ) ) {
 		return NaN;
 	}
 	// Special case: +infinity