drm/ttm: fix ttm_bo_swapout

Commit 7120a447c7fe ("drm/ttm: Double check mem_type of BO while eviction")
made ttm_bo_evict_swapout_allowable() function actually check the
placement, but we always used a dummy placement in ttm_bo_swapout.

Fix this by using the real placement instead.

Signed-off-by: Christian König <[e-mail]>
Fixes: 7120a447c7fe ("drm/ttm: Double check mem_type of BO while eviction")
Reviewed-by: Pan, Xinhui <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/ttm/ttm_bo.c

···
 	 * as an indication that we're about to swap out.
 	 */
 	memset(&place, 0, sizeof(place));
-	place.mem_type = TTM_PL_SYSTEM;
+	place.mem_type = bo->resource->mem_type;
 	if (!ttm_bo_evict_swapout_allowable(bo, ctx, &place, &locked, NULL))
 		return -EBUSY;
 
···
 		struct ttm_place hop;
 
 		memset(&hop, 0, sizeof(hop));
+		place.mem_type = TTM_PL_SYSTEM;
 		ret = ttm_resource_alloc(bo, &place, &evict_mem);
 		if (unlikely(ret))
 			goto out;