The clk API may return 0 on clk_get_rate(), so we should check the
result before using it as a divisor.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: NJoachim Eastwood <manabian@gmail.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>