[Where] Light refactoring.

Author: reegeek

src/StructLinq/Where/WhereEnumerable.cs

@@ -97,9 +97,7 @@ public WhereVisitor(Func<TIn, bool> function, ref TVisitor visitor)
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public bool Visit(TIn input)
         {
-            if (function(input))
-                return visitor.Visit(input);
-            return true;
+            return !function(input) || visitor.Visit(input);
         }
     }
 }