vout: remove the dummy display pool

With the previous commit, the vout wrapper's display pool is no longer
used ever if direct rendering is not in use. Removing it saves one
picture buffer.
Signed-off-by: Rafaël Carré <funman@videolan.org>

src/video_output/vout_wrapper.c

@@ -113,16 +113,9 @@ static void NoDrInit(vout_thread_t *vout)
     if (sys->display.use_dr)
         sys->display_pool = vout_display_Pool(sys->display.vd, 3);
     else
-        //sys->display_pool = picture_pool_Reserve(sys->decoder_pool, DISPLAY_PICTURE_COUNT);
-        sys->display_pool = picture_pool_NewFromFormat(&sys->display.vd->source, DISPLAY_PICTURE_COUNT);
+        sys->display_pool = NULL;
 }
-static void NoDrClean(vout_thread_t *vout)
-{
-    vout_thread_sys_t *sys = vout->p;
 
-    if (!sys->display.use_dr)
-        picture_pool_Delete(sys->display_pool);
-}
 int vout_InitWrapper(vout_thread_t *vout)
 {
     vout_thread_sys_t *sys = vout->p;
@@ -176,10 +169,8 @@ void vout_EndWrapper(vout_thread_t *vout)
     if (sys->private_pool)
         picture_pool_Delete(sys->private_pool);
 
-    if (sys->decoder_pool != sys->display_pool) {
-        NoDrClean(vout);
+    if (sys->decoder_pool != sys->display_pool)
         picture_pool_Delete(sys->decoder_pool);
-    }
 }
 
 /*****************************************************************************
@@ -194,8 +185,6 @@ void vout_ManageWrapper(vout_thread_t *vout)
     vout_ManageDisplay(vd, !sys->display.use_dr || reset_display_pool);
 
     if (reset_display_pool) {
-        NoDrClean(vout);
-
         sys->display.use_dr = !vout_IsDisplayFiltered(vd);
         NoDrInit(vout);
     }