cpufreq: fix memory leak in cpufreq_stats

According to the cm-crespo kernel source; https://github.com/CyanogenMod/android_kernel_samsung_crespo/commit/58fc7887cc994334ce93aa70c3f141b4342fd206
There is some memory leak happening each time a cpu gets offlined.

Its probably not usefull for our defy, since its not a smp system,
but we shouldn't miss those memory fixes.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
cpufreq: fix memory leaks in cpufreq

Signed-off-by: Blechd0se <alex.christ@hotmail.de>