drm/mediatek: switch to drm_*_get(), drm_*_put() helpers

Use drm_*_get() and drm_*_put() helpers instead of drm_*_reference()
and drm_*_unreference() helpers.

drm_*_reference() and drm_*_unreference() functions are just
compatibility alias for drm_*_get() and drm_*_put() and should not be
used by new code. So convert all users of compatibility functions to
use the new APIs.

Generated by: scripts/coccinelle/api/drm-get-put.cocci

Signed-off-by: Cihangir Akturk <cakturk@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1502454794-28558-14-git-send-email-cakturk@gmail.com

drivers/gpu/drm/mediatek/mtk_drm_fb.c

@@ -58,7 +58,7 @@ static void mtk_drm_fb_destroy(struct drm_framebuffer *fb)
 
 	drm_framebuffer_cleanup(fb);
 
-	drm_gem_object_unreference_unlocked(mtk_fb->gem_obj);
+	drm_gem_object_put_unlocked(mtk_fb->gem_obj);
 
 	kfree(mtk_fb);
 }
@@ -160,6 +160,6 @@ struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
 	return &mtk_fb->base;
 
 unreference:
-	drm_gem_object_unreference_unlocked(gem);
+	drm_gem_object_put_unlocked(gem);
 	return ERR_PTR(ret);
 }

drivers/gpu/drm/mediatek/mtk_drm_gem.c

@@ -122,7 +122,7 @@ int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
 		goto err_handle_create;
 
 	/* drop reference from allocate - handle holds it now. */
-	drm_gem_object_unreference_unlocked(&mtk_gem->base);
+	drm_gem_object_put_unlocked(&mtk_gem->base);
 
 	return 0;