netapi32: Correctly reallocate buffer in NetWkstaUserGetInfo.

[Thomas Faber]

- If NetApiBufferReallocate failed, the old buffer is not freed so we
  need to do that if we're gonna return failure.
- If NetApiBufferReallocate succeeded, the buffer can have moved, so
  the wkui0_username member needs to be updated. This happens e.g.
  when running with Debug Page Heap.
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