Removed unused variable

src/video/cocoa/SDL_cocoawindow.m

@@ -935,8 +935,6 @@ Cocoa_UpdateClipCursor(SDL_Window * window)
 - (void)windowDidEnterFullScreen:(NSNotification *)aNotification
 {
     SDL_Window *window = _data.window;
-    SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
-    NSWindow *nswindow = data.nswindow;
 
     inFullscreenTransition = NO;