shlwapi: Make sure we don't write anything to output buffer if its size is too small to store the whole result

[Jacek Caban]

---
  dlls/shlwapi/tests/url.c |   11 +++++++++++
  dlls/shlwapi/url.c       |   16 ++++++----------
  2 files changed, 17 insertions(+), 10 deletions(-)


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