OMAP: DSS2: Taal: Fix DSI bus locking problem

If omapdss_dsi_display_enable() failed the DSI bus was left locked. Also
if the operation failed later omapdss_dsi_display_disable() would get
called without holding the bus lock.

Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

drivers/video/omap2/displays/panel-taal.c

@@ -702,10 +702,9 @@ static int taal_power_on(struct omap_dss_device *dssdev)
 
 	return 0;
 err:
-	dsi_bus_unlock();
-
 	omapdss_dsi_display_disable(dssdev);
 err0:
+	dsi_bus_unlock();
 	if (dssdev->platform_disable)
 		dssdev->platform_disable(dssdev);