Fixed broken video with direct3d for some drivers.

(cherry picked from commit c05fa125)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/video_output/msw/direct3d.c

@@ -252,8 +252,6 @@ static void Prepare(vout_display_t *vd, picture_t *picture)
     Direct3DUnlockSurface(picture);
 
     Direct3DRenderScene(vd, surface);
-
-    Direct3DLockSurface(picture);
 #endif
 }
 
@@ -270,10 +268,12 @@ static void Display(vout_display_t *vd, picture_t *picture)
     if (FAILED(hr)) {
         msg_Dbg(vd, "%s:%d (hr=0x%0lX)", __FUNCTION__, __LINE__, hr);
     }
+
 #if 0
     VLC_UNUSED(picture);
 #else
     /* XXX See Prepare() */
+    Direct3DLockSurface(picture);
     picture_Release(picture);
 #endif