platform/x86/intel/pmt: Fix kobject memory leak on init failure

platform/x86/intel/pmt: Fix kobject memory leak on init failure

When kobject_init_and_add() fails in pmt_features_discovery(), the
function returns without calling kobject_put(). This violates the
kobject API contract where kobject_put() must be called even on
initialization failure to properly release allocated resources.

Fixes: d9a078809356 ("platform/x86/intel/pmt: Add PMT Discovery driver")
Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Link: https://patch.msgid.link/20251223084041.3832933-1-kaushlendra.kumar@intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>