GUID in the target buffer is returned. If no match is found, then NULL is returned.\r
If Length is 0, then NULL is returned.\r
If Length > 0 and Buffer is NULL, then ASSERT().\r
GUID in the target buffer is returned. If no match is found, then NULL is returned.\r
If Length is 0, then NULL is returned.\r
If Length > 0 and Buffer is NULL, then ASSERT().\r