[1/2] advpack: Add some error handling to get_dest_dir.

[Michael Karcher]

This patch is intended to break an advpack test (line 441), which
already broke with no optimization on Ubuntu gutsy's gcc 4.1, and
usually worked just by chance.

Alexandre: If you do not want the broken test to show up, merge this
patch with the [2/2] following, which fixes the original bug. Alas, they
are not independent.
If you just want a bug fix for the testcase because of the freeze, and
still leave the dangerous access to uninitialized memory in, I will
prepare a simpler patch, the minimal patch to make the testcase
definitely pass is two lines. (but I don't want to encourage that
decision which would be, in my oppinion, wrong, even in a freeze).
---
 dlls/advpack/advpack.c |   72 ++++++++++++++++++++++++++++++-----------------
 1 files changed, 46 insertions(+), 26 deletions(-)
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