[evolution-kolab] ECalBackendKolab: avoid possible segfault when removing objects

[Christian Hilberg <chilberg src gnome org>]

commit 647a46c29abb57e96393471f91366e4e7434b51e
Author: Christian Hilberg <hilberg kernelconcepts de>
Date:   Wed Aug 29 17:53:01 2012 +0200

    ECalBackendKolab: avoid possible segfault when removing objects

 src/calendar/e-cal-backend-kolab.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/src/calendar/e-cal-backend-kolab.c b/src/calendar/e-cal-backend-kolab.c
index 57874a6..b829781 100644
--- a/src/calendar/e-cal-backend-kolab.c
+++ b/src/calendar/e-cal-backend-kolab.c
@@ -1228,6 +1228,8 @@ cal_backend_kolab_remove_objects (ECalBackendSync *backend,
 	ECalComponent *oldcomp = NULL;
 	ECalComponent *newcomp = NULL;
 	ECalComponent *oldtz = NULL;
+	ECalComponent *oc_data = NULL;
+	ECalComponent *nc_data = NULL;
 	ECalComponentId *id = NULL;
 	const gchar *uid, *rid;
 	KolabSettingsHandler *ksettings = NULL;
@@ -1381,10 +1383,15 @@ cal_backend_kolab_remove_objects (ECalBackendSync *backend,
 		}
 	}
 
+	if (*old_components != NULL)
+		oc_data = (*old_components)->data;
+	if (*new_components = NULL)
+		nc_data = (*new_components)->data;
+	
 	e_cal_backend_notify_component_removed (E_CAL_BACKEND (backend),
 	                                        id,
-	                                        (*old_components)->data,
-	                                        (*new_components)->data);
+	                                        oc_data,
+	                                        nc_data);
 	e_cal_component_free_id (id);
 }