OSX GUI: don't check for interface pointer

It'll be valid the first time this function is called
(cherry picked from commit f4fb3707e66d259e20ad5de35bcaf599d9c59518)
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

modules/gui/macosx/intf.m

@@ -677,9 +677,6 @@ static VLCMain *_o_sharedMainInstance = nil;
 
 - (void)applicationWillTerminate:(NSNotification *)notification
 {
-    if( !p_intf )
-        return;
-
     /* don't allow a double termination call. If the user has
      * already invoked the quit then simply return this time. */
     static bool f_appExit = false;