[gtk+] GtkPlacesSidebar: Don't crash on dnd

[Matthias Clasen <matthiasc src gnome org>]

commit 041ccd7f878f6412c3a47eec4665ea86123ea048
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Oct 25 15:55:54 2014 -0400

    GtkPlacesSidebar: Don't crash on dnd
    
    gtk_get_current_event() can return NULL. Don't crash if it does.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739150

 gtk/gtkplacessidebar.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkplacessidebar.c b/gtk/gtkplacessidebar.c
index c6d53f7..cdc5ce1 100644
--- a/gtk/gtkplacessidebar.c
+++ b/gtk/gtkplacessidebar.c
@@ -1420,11 +1420,13 @@ static gboolean
 clicked_eject_button (GtkPlacesSidebar  *sidebar,
                       GtkTreePath      **path)
 {
-  GdkEvent *event = gtk_get_current_event ();
-  GdkEventButton *button_event = (GdkEventButton *) event;
+  GdkEvent *event;
 
-  if ((event->type == GDK_BUTTON_PRESS || event->type == GDK_BUTTON_RELEASE) &&
-       over_eject_button (sidebar, button_event->x, button_event->y, path))
+  event = gtk_get_current_event ();
+
+  if (event &&
+      (event->type == GDK_BUTTON_PRESS || event->type == GDK_BUTTON_RELEASE) &&
+       over_eject_button (sidebar, ((GdkEventButton *)event)->x, ((GdkEventButton *)event)->y, path))
     return TRUE;
 
   return FALSE;