netapi32: Free the correct pointers.

[Huw Davies]

Fixes Valgrind warnings like:

 Invalid free() / delete / delete[]
    at  notify_free (heap.c:199)
    by  RtlFreeHeap (heap.c:1284)
    by  DsRoleFreeMemory (ds.c:73)
    by  test_get (ds.c:63)
    by  func_ds (ds.c:87)
    by  run_test (test.h:449)
    by  main (test.h:498)
---
 dlls/netapi32/ds.c       |    1 +
 dlls/netapi32/tests/ds.c |    6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)
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