Bug 657770 - Write to released memory in gtkdnd-quartz.c
Bug 657770 - Write to released memory in gtkdnd-quartz.c

Clear the Drag paste board just before the info->context is released.
This way the GtkDragSourceOwner is released just before the drag context
is and thus can pasteboard:provideDataForType: not accidentally access
an already released drag context

johne53/MB3Gtk-2,Distrotech/gtk,Unity-Technologies/gtk,Distrotech/gtk,johne53/MB3Gtk-2,Distrotech/gtk,Unity-Technologies/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Unity-Technologies/gtk,Distrotech/gtk,johne53/MB3Gtk-2,Unity-Technologies/gtk,Distrotech/gtk,Unity-Technologies/gtk