Reduce nesting.

src/Generator/Passes/CheckAmbiguousFunctions.cs

@@ -105,8 +105,9 @@ namespace CppSharp.Passes
         {
             var method1 = function as Method;
             var method2 = overload as Method;
-            if (method1 != null && method2 != null)
-            {
+            if (method1 == null || method2 == null)
+                return false;
+
             var sameParams = method1.Parameters.SequenceEqual(method2.Parameters,
                 ParameterTypeComparer.Instance);
 
@@ -121,7 +122,6 @@ namespace CppSharp.Passes
                 method2.ExplicitlyIgnore();
                 return true;
             }
-            }
 
             return false;
         }