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/math/base/special/hyp2f1/lib/hyp2f1negcequalbc.js

@@ -58,20 +58,17 @@ function hyp2f1NegCEqualBC( a, b, x ) {
 	collector = 1.0;
 	sum = 1.0;
 
-	if ( !( abs( b ) < 1.0e5 ) ) {
+	if ( abs( b ) >= 1.0e5 ) {
 		return NaN;
 	}
-
 	for ( k = 1; k <= -b; k++ ) {
-		collector *= ( a + k - 1.0 ) * x / k;
+		collector *= ( ( a + k - 1.0 ) * x ) / k;
 		collectorMax = max( abs( collector ), collectorMax );
 		sum += collector;
 	}
-
 	if ( 1.0e-16 * ( 1.0 + ( collectorMax / abs( sum ) ) ) > 1.0e-7 ) {
 		return NaN;
 	}
-
 	return sum;
 }