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Addendum to commit c498d0930a.
`SmpTranslateSystemPartitionInformation()`: Reset the `DirInfo->Name.Buffer`
to use the `DirInfoBuffer` scratch area, before doing the OS boot drive letter
fallback. Otherwise, writing directly to `DirInfo->Name.Buffer` would
use its old value, that is going to be `NULL` when the calls to
`NtQueryDirectoryObject()` failed, and this would induce a memory access
crash.
Take also the opportunity to use structures embedding the
`KEY_VALUE_PARTIAL_INFORMATION` and `OBJECT_DIRECTORY_INFORMATION`
data headers, instead of straight `CHAR` arrays. This allows the
structures to use the correct memory alignments required by these
data headers.