[RFC] audit: allow audit_reusename to check kernel path

For now, we met a situation where the audit_reusename checking function returns the same filename structure for files sharing the same uptr. However, these files are different, and we are trying to open them in a loop where the names are loaded into the same address. Therefore, the function returns the same structure for different files. By the way, may I ask in what situation would the audit_list be kept across syscalls?