clocksource/drivers/cadence-ttc: Add missing clk_disable_unprepare in ttc_setup_clockevent

Add the missing clk_disable_unprepare() before return in
ttc_setup_clockevent().

Signed-off-by: Gaosheng Cui <[e-mail]>
Reviewed-by: Michal Simek <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>

drivers/clocksource/timer-cadence-ttc.c

···
 				    &ttcce->ttc.clk_rate_change_nb);
 	if (err) {
 		pr_warn("Unable to register clock notifier.\n");
-		goto out_kfree;
+		goto out_clk_unprepare;
 	}
 
 	ttcce->ttc.freq = clk_get_rate(ttcce->ttc.clk);
···
 	err = request_irq(irq, ttc_clock_event_interrupt,
 			  IRQF_TIMER, ttcce->ce.name, ttcce);
 	if (err)
-		goto out_kfree;
+		goto out_clk_unprepare;
 
 	clockevents_config_and_register(&ttcce->ce,
 			ttcce->ttc.freq / PRESCALE, 1, 0xfffe);
 
 	return 0;
 
+out_clk_unprepare:
+	clk_disable_unprepare(ttcce->ttc.clk);
 out_kfree:
 	kfree(ttcce);
 	return err;