drm/fsl-dcu: Replace drm_dev_unref with drm_dev_put

This patch unifies the naming of DRM functions for reference counting
of struct drm_device. The resulting code is more aligned with the rest
of the Linux kernel interfaces.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180926114312.23097-1-tzimmermann@suse.de

drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c

@@ -353,12 +353,12 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
 
 	ret = drm_dev_register(drm, 0);
 	if (ret < 0)
-		goto unref;
+		goto put;
 
 	return 0;
 
-unref:
-	drm_dev_unref(drm);
+put:
+	drm_dev_put(drm);
 unregister_pix_clk:
 	clk_unregister(fsl_dev->pix_clk);
 disable_clk:
@@ -371,7 +371,7 @@ static int fsl_dcu_drm_remove(struct platform_device *pdev)
 	struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 
 	drm_dev_unregister(fsl_dev->drm);
-	drm_dev_unref(fsl_dev->drm);
+	drm_dev_put(fsl_dev->drm);
 	clk_disable_unprepare(fsl_dev->clk);
 	clk_unregister(fsl_dev->pix_clk);