This error path needs to call clk_disable_unprepare().

Fixes: 7296443b ("PM / devfreq: tegra30: Handle possible round-rate error")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NDmitry Osipenko <digetx@gmail.com>
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>