fix: use variable after initialization

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/hyp2f1/lib/main.js

@@ -118,13 +118,13 @@ function hyp2f1( a, b, c, x ) {
 	var i;
 
 	err = 0.0;
+	s = 1.0 - x;
+	d = c - a - b;
 	ax = abs( x );
 	ia = round( a );
 	ib = round( b );
 	id = round( d );
 	ic = round( c );
-	s = 1.0 - x;
-	d = c - a - b;
 	negIntA = isNonPositiveInteger( a );
 	negIntB = isNonPositiveInteger( b );
 	negIntC = isNonPositiveInteger( c );