[NUI] Fix Utility.Dispose not to set null to method parameter

Setting a value to method parameter does not work unless the method
parameter is defined with out keyword.

Not to confuse users, setting null to method parameter is removed.

diff --git a/src/Tizen.NUI.Components/Utils/Utility.cs b/src/Tizen.NUI.Components/Utils/Utility.cs
index ec704ec..2c28b4e 100755 (executable)
--- a/src/Tizen.NUI.Components/Utils/Utility.cs
+++ b/src/Tizen.NUI.Components/Utils/Utility.cs
@@ -34,7 +34,6 @@ namespace Tizen.NUI.Components
                 }
 
                 child.Dispose();
-                child = null;
             }
         }
     }