thermal: devfreq_cooling: avoid unnecessary kfree of freq_table

thermal: devfreq_cooling: avoid unnecessary kfree of freq_table

dfc->freq_table is only allocated in the non-EM path via
devfreq_cooling_gen_tables(). In the EM path, it remains NULL.

Avoid calling kfree() unnecessarily when freq_table was never allocated.

This resolves a Smatch warning:
calling kfree() when 'dfc->freq_table' is always NULL.

Signed-off-by: Anas Iqbal <mohd.abd.6602@gmail.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20260323094018.2264-1-mohd.abd.6602@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>