cpufreq: intel_pstate: Rearrange variable declaration involving __free()

cpufreq: intel_pstate: Rearrange variable declaration involving __free()

Follow cleanup.h recommendations and define and assign a variable
in one statement when __free() is used.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
Link: https://patch.msgid.link/2251447.irdbgypaU6@rafael.j.wysocki