[msitools] libmsi: guard calls of parent class constructed method

[Marc-Andre Lureau <malureau src gnome org>]

commit 482ea4104953dd882ce435e3d45320b3f7114d72
Author: Paolo Bonzini <pbonzini redhat com>
Date:   Thu Jan 17 13:48:48 2013 +0100

    libmsi: guard calls of parent class constructed method
    
    RHEL6's glib 2.22 leaves a NULL pointer there.

 libmsi/libmsi-database.c     |    3 ++-
 libmsi/libmsi-query.c        |    3 ++-
 libmsi/libmsi-record.c       |    3 ++-
 libmsi/libmsi-summary-info.c |    3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/libmsi/libmsi-database.c b/libmsi/libmsi-database.c
index 5bf3321..1a0da2f 100644
--- a/libmsi/libmsi-database.c
+++ b/libmsi/libmsi-database.c
@@ -101,7 +101,8 @@ libmsi_database_init (LibmsiDatabase *self)
 static void
 libmsi_database_constructed (GObject *object)
 {
-    G_OBJECT_CLASS (libmsi_database_parent_class)->constructed (object);
+    if (G_OBJECT_CLASS (libmsi_database_parent_class)->constructed)
+        G_OBJECT_CLASS (libmsi_database_parent_class)->constructed (object);
 }
 
 static void
diff --git a/libmsi/libmsi-query.c b/libmsi/libmsi-query.c
index c4e919b..eacbb8c 100644
--- a/libmsi/libmsi-query.c
+++ b/libmsi/libmsi-query.c
@@ -107,7 +107,8 @@ libmsi_query_get_property (GObject *object, guint prop_id, GValue *value, GParam
 static void
 libmsi_query_constructed (GObject *object)
 {
-    G_OBJECT_CLASS (libmsi_query_parent_class)->constructed (object);
+    if (G_OBJECT_CLASS (libmsi_query_parent_class)->constructed)
+        G_OBJECT_CLASS (libmsi_query_parent_class)->constructed (object);
 }
 
 static void
diff --git a/libmsi/libmsi-record.c b/libmsi/libmsi-record.c
index da5d8bf..645d7eb 100644
--- a/libmsi/libmsi-record.c
+++ b/libmsi/libmsi-record.c
@@ -122,7 +122,8 @@ libmsi_record_constructed (GObject *object)
     // FIXME: +1 could be removed if accessing with idx-1
     self->fields = g_new0 (LibmsiField, self->count + 1);
 
-    G_OBJECT_CLASS (libmsi_record_parent_class)->constructed (object);
+    if (G_OBJECT_CLASS (libmsi_record_parent_class)->constructed)
+        G_OBJECT_CLASS (libmsi_record_parent_class)->constructed (object);
 }
 
 static void
diff --git a/libmsi/libmsi-summary-info.c b/libmsi/libmsi-summary-info.c
index c8d9234..ee9d32d 100644
--- a/libmsi/libmsi-summary-info.c
+++ b/libmsi/libmsi-summary-info.c
@@ -128,7 +128,8 @@ libmsi_summary_info_constructed (GObject *object)
         }
     }
 
-    G_OBJECT_CLASS (libmsi_summary_info_parent_class)->constructed (object);
+    if (G_OBJECT_CLASS (libmsi_summary_info_parent_class)->constructed)
+        G_OBJECT_CLASS (libmsi_summary_info_parent_class)->constructed (object);
 }
 
 static void