rpcrt4: Initialise the memory in test_simple_struct_marshal before passing it to NdrSimpleStructUnmarshall.

[Robert Shearman]

Otherwise, the unmarshalling code will read from unintialised memory 
when trying to reuse the embedded pointers in the memory block.

Also fix a couple of memory leaks.
---
  dlls/rpcrt4/tests/ndr_marshall.c |    5 ++++-
  1 files changed, 4 insertions(+), 1 deletions(-)

This also fixes running the tests in Windows under a debugger, since 
Windows calls a break point when freeing an invalid pointer, which 
happened because of this code.
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