[gobject-introspection] [everything] Allow passing NULL to the callback

[Johan Dahlin <johan src gnome org>]

commit 263af175f3630ac5c6b215e25d19bfb10a41253d
Author: Johan Dahlin <johan gnome org>
Date:   Thu Dec 3 19:14:31 2009 -0200

    [everything] Allow passing NULL to the callback

 gir/Everything-1.0-expected.gir |    5 ++++-
 gir/everything.c                |    6 ++++--
 2 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/gir/Everything-1.0-expected.gir b/gir/Everything-1.0-expected.gir
index 7e3caae..2518a6d 100644
--- a/gir/Everything-1.0-expected.gir
+++ b/gir/Everything-1.0-expected.gir
@@ -656,7 +656,10 @@ case.">
         <type name="int" c:type="int"/>
       </return-value>
       <parameters>
-        <parameter name="callback" transfer-ownership="none" scope="call">
+        <parameter name="callback"
+                   transfer-ownership="none"
+                   allow-none="1"
+                   scope="call">
           <type name="TestCallback" c:type="TestCallback"/>
         </parameter>
       </parameters>
diff --git a/gir/everything.c b/gir/everything.c
index e73d8ca..563a05f 100644
--- a/gir/everything.c
+++ b/gir/everything.c
@@ -1515,13 +1515,15 @@ test_sub_obj_unset_bare (TestSubObj *obj)
 
 /**
  * test_callback:
- * @callback: (scope call):
+ * @callback: (scope call) (allow-none):
  *
  **/
 int
 test_callback (TestCallback callback)
 {
-  return callback();
+    if (callback != NULL)
+        return callback();
+    return 0;
 }
 
 /**