cpufreq: Fix unsigned variable being checked for negative value

clk_round_rate() returns singed value which was assigned to an unsigned
variable.
So it can't be checked for negative.

Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>