NTSTATUS __stdcall PiUEventHandleUnregisterClient(FILE_OBJECT *FileObject){
FAST_MUTEX **FsContext2;
NTSTATUS v2;
_FAST_MUTEX *v3;
FsContext2 = (FAST_MUTEX **)FileObject->FsContext2;
v2 = 0;
if( !FsContext2 )
return -1073741811;
ExAcquireFastMutex(FsContext2[2]);
v3 = FsContext2[2];
*((_BYTE *)FsContext2 + 140) = 0;
KeReleaseGuardedMutex(v3);
return v2;
}