Anyone may call clk_round_rate() with a zero rate value, so we have to
protect against that.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NMichael Turquette <mturquette@linaro.org>