drm/tegra: Disable clock on probe failure

Add a missing clk_disable_unprepare() before returning from the driver's
.probe() function on error.

Signed-off-by: Wei Yongjun <[e-mail]>
Reviewed-by: Terje Bergstrom <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/gpu/drm/tegra/gr2d.c

···
 	err = host1x_client_register(&gr2d->client.base);
 	if (err < 0) {
 		dev_err(dev, "failed to register host1x client: %d\n", err);
+		clk_disable_unprepare(gr2d->clk);
 		return err;
 	}