config: Coverity code defects fixes

Coverity code defects fixes :

• CID 716570: Resource leak in ntoskrnl/config/cminit.c, plus change ExFreePool --> ExFreePoolWithTag.
• CID 716669: Deference before null check in ntoskrnl/config/cmparse.c --> Add some ASSERTs.
• CID 716760: Uninitialized pointer read in ntoskrnl/config/cmsysinit.c --> Init two handles to NULL.
• Transform some IN --> OUT parameters of CmpOpenHiveFiles in cminit.c
• Code formatting in cmparse.c