CVE-2026-23137 of: unittest: Fix memory leak in unittest_data_add()

In the Linux kernel, the following vulnerability has been resolved: of: unittest: Fix memory leak in unittestdataadd In unittestdataadd, if ofresolvephandles fails, the allocated unittestdata is not freed, leading to a memory leak. Fix this by using scope-based cleanup helper freekfree for...