drm/rcar-du: dw-hdmi: Fix compilation

Commit eea034af90 ("drm/bridge/synopsys: dw-hdmi: don't clobber drvdata")
broke the build with one build error and one warning. Fix both.

Cc: Archit Taneja <architt@codeaurora.org>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Fixes: eea034af90 ("drm/bridge/synopsys: dw-hdmi: don't clobber drvdata")
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180216154412.22876-1-maxime.ripard@bootlin.com

drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c

@@ -75,11 +75,13 @@ static int rcar_dw_hdmi_probe(struct platform_device *pdev)
 		return PTR_ERR(hdmi);
 
 	platform_set_drvdata(pdev, hdmi);
+
+	return 0;
 }
 
 static int rcar_dw_hdmi_remove(struct platform_device *pdev)
 {
-	struct dw_hdmi *hdmi = platform_get_drvdata(dev);
+	struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
 
 	dw_hdmi_remove(hdmi);