[evolution] Fix a crash in itip-view.c:extract_itip_data()

[Milan Crha <mcrha src gnome org>]

commit a46c95a4bc1915337ded3c7e3f5a144fba68a2c2
Author: Milan Crha <mcrha redhat com>
Date:   Tue May 21 17:19:13 2019 +0200

    Fix a crash in itip-view.c:extract_itip_data()
    
    A typo in the code after the port to libical-glib/libecal-2.0.

 src/modules/itip-formatter/itip-view.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/modules/itip-formatter/itip-view.c b/src/modules/itip-formatter/itip-view.c
index 7ef740476f..0492a19a02 100644
--- a/src/modules/itip-formatter/itip-view.c
+++ b/src/modules/itip-formatter/itip-view.c
@@ -6087,7 +6087,7 @@ extract_itip_data (ItipView *view,
                /* Determine any delegate sections */
                for (prop = i_cal_component_get_first_property (view->priv->ical_comp, I_CAL_X_PROPERTY);
                     prop;
-                    g_object_unref (prop), i_cal_component_get_next_property (view->priv->ical_comp, 
I_CAL_X_PROPERTY)) {
+                    g_object_unref (prop), prop = i_cal_component_get_next_property (view->priv->ical_comp, 
I_CAL_X_PROPERTY)) {
                        const gchar *x_name, *x_val;
 
                        x_name = i_cal_property_get_x_name (prop);