drm/rockchip: Drop unbalanced obj unref

[ Upstream commit 8ee3b0e ]

In the error path, rockchip_drm_gem_object_mmap() is dropping an obj
reference that it doesn't own.

Fixes: 41315b7 ("drm/rockchip: use drm_gem_mmap helpers")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230119231734.2884543-1-robdclark@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/gpu/drm/rockchip/rockchip_drm_gem.c

@@ -261,9 +261,6 @@ static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 	else
 		ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
 
-	if (ret)
-		drm_gem_vm_close(vma);
-
 	return ret;
 }