OMAPDSS: HDMI: Make panel return dssdev register errors

Do not assume blindly that the DSS driver was registered successfully.
Signed-off-by: Ricardo Neri <ricardo.neri@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/hdmi_panel.c

@@ -404,9 +404,7 @@ int hdmi_panel_init(void)
 	spin_lock_init(&hdmi.audio_lock);
 #endif
 
-	omap_dss_register_driver(&hdmi_driver);
-
-	return 0;
+	return omap_dss_register_driver(&hdmi_driver);
 }
 
 void hdmi_panel_exit(void)