Android: Restored Philipp's joystick change, lost in the previous merge.

This patch, specifically: https://hg.libsdl.org/SDL/rev/c0976de9c332

src/joystick/android/SDL_sysjoystick.c

@@ -323,7 +323,6 @@ Android_RemoveJoystick(int device_id)
 {
     SDL_joylist_item *item = SDL_joylist;
     SDL_joylist_item *prev = NULL;
-    int retval;
 #if !SDL_EVENTS_DISABLED
     SDL_Event event;
 #endif
@@ -341,7 +340,6 @@ Android_RemoveJoystick(int device_id)
         return -1;
     }
 
-    retval = item->device_instance;
     if (item->joystick) {
         item->joystick->hwdata = NULL;
     }