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 <cuigaosheng1@huawei.com>
Reviewed-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20240803064253.331946-3-cuigaosheng1@huawei.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>