cpufreq: Drop redundant check for inactive policies

We just made sure policy->cpu is online and this check will always fail
as the policy is active. Drop it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>