[valadoc] doclets/gtkdoc: Do not document target_destroy_notify if type is not owned

[Luca Bruno <lucabru src gnome org>]

commit b43fcb08dc1552663b0445e03ed18bc10feb63de
Author: Luca Bruno <lucabru src gnome org>
Date:   Thu Jul 28 10:36:35 2011 +0200

    doclets/gtkdoc: Do not document target_destroy_notify if type is not owned
    
    Fixes bug 637088.

 src/doclets/gtkdoc/generator.vala |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/src/doclets/gtkdoc/generator.vala b/src/doclets/gtkdoc/generator.vala
index e1a1c9d..950d57e 100644
--- a/src/doclets/gtkdoc/generator.vala
+++ b/src/doclets/gtkdoc/generator.vala
@@ -697,9 +697,11 @@ It is important that your <link linkend=\"GValue\"><type>GValue</type></link> ho
 		if (param.parameter_type.data_type is Api.Delegate) {
 			add_custom_header ("%s_target".printf (param_name), "user data to pass to @%s".printf (param_name),
 				{"allow-none", "closure"}, get_parameter_pos (current_method_or_delegate, param_name)+0.1);
-			add_custom_header ("%s_target_destroy_notify".printf (param_name), 
-				"function to call when @%s_target is no longer needed".printf (param_name), {"allow-none"},
-				get_parameter_pos (current_method_or_delegate, param_name)+0.2);
+			if (param.parameter_type.is_owned) {
+				add_custom_header ("%s_target_destroy_notify".printf (param_name),
+								   "function to call when @%s_target is no longer needed".printf (param_name), {"allow-none"},
+								   get_parameter_pos (current_method_or_delegate, param_name)+0.2);
+			}
 		}
 
 		if (current_dbus_member != null) {