drm/ttm: Don't leak a resource on swapout move error

If moving the bo to system for swapout failed, we were leaking
a resource. Fix.

Fixes: bfa3357 ("drm/ttm: allocate resource object instead of embedding it v2")
Cc: Christian König <[email protected]>
Cc: "Christian König" <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # v5.14+
Signed-off-by: Thomas Hellström <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Reviewed-by: Christian König <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: Thomas Hellström

drivers/gpu/drm/ttm/ttm_bo.c

@@ -1167,6 +1167,7 @@ int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
 		ret = ttm_bo_handle_move_mem(bo, evict_mem, true, &ctx, &hop);
 		if (unlikely(ret != 0)) {
 			WARN(ret == -EMULTIHOP, "Unexpected multihop in swaput - likely driver bug.\n");
+			ttm_resource_free(bo, &evict_mem);
 			goto out;
 		}
 	}