Fix memory leaks by adding missing FreePool calls: free handle buffers in Stop and initialization routines. REF:https://uefi.org/sites/default/files/resources/UEFI_Spec_Final_2.11.pdf Chapter 7.3.15: "Services - Boot Services.LocateHandleBuffer": It is the caller's responsibility to call the Boot Service.FreePool when the caller no longer requires the contents of Buffer. Signed-off-by: Dongyan Qian <qiandongyan@loongson.cn>