Move the add/del_callback call (to be sure to have the needed ressources).

(cherry picked from commit 4bea3fe8)
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

modules/video_filter/deinterlace.c

@@ -389,12 +389,12 @@ static int Init( vout_thread_t *p_vout )
         return VLC_EGENERIC;
     }
 
-    var_AddCallback( p_vout, "deinterlace-mode", FilterCallback, NULL );
-
     vout_filter_AllocateDirectBuffers( p_vout, VOUT_MAX_PICTURES );
 
     vout_filter_AddChild( p_vout, p_vout->p_sys->p_vout, MouseEvent );
 
+    var_AddCallback( p_vout, "deinterlace-mode", FilterCallback, NULL );
+
     return VLC_SUCCESS;
 }
 
@@ -418,6 +418,8 @@ static void End( vout_thread_t *p_vout )
 {
     vout_sys_t *p_sys = p_vout->p_sys;
 
+    var_DelCallback( p_vout, "deinterlace-mode", FilterCallback, NULL );
+
     if( p_sys->p_vout )
     {
         vout_filter_DelChild( p_vout, p_sys->p_vout, MouseEvent );