Remove observer from the notification center in the dealloc method to prevent a crash when notification center posts NSApplicationWillTerminateNotification and the VLAboutBox has already been released.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 5995ceeb)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>