drm/tegra: switch to postclose

I didn't spot anything that would require ordering here (well not
anywhere else either), and I'm trying to unify at least modern drivers
on one close hook.

Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-tegra@vger.kernel.org
Reviewed-by: NSean Paul <seanpaul@chromium.org>
Reviewed-by: NLiviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170508082633.4214-2-daniel.vetter@ffwll.ch

drivers/gpu/drm/tegra/drm.c

@@ -804,7 +804,7 @@ static const struct file_operations tegra_drm_fops = {
 	.llseek = noop_llseek,
 };
 
-static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
+static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
 {
 	struct tegra_drm_file *fpriv = file->driver_priv;
 	struct tegra_drm_context *context, *tmp;
@@ -868,7 +868,7 @@ static struct drm_driver tegra_drm_driver = {
 	.load = tegra_drm_load,
 	.unload = tegra_drm_unload,
 	.open = tegra_drm_open,
-	.preclose = tegra_drm_preclose,
+	.postclose = tegra_drm_postclose,
 	.lastclose = tegra_drm_lastclose,
 
 #if defined(CONFIG_DEBUG_FS)