user32: Add argument check for PTITLEBARINFO in GetTitleBarInfo().

[Rico Schüller]

Hi,

this patch adds a check for PTITLEBARINFO in GetTitleBarInfo() to avoid 
a crash. This fixes bug 20249 .

Cheers
Rico

---
  dlls/user32/nonclient.c |    6 ++++++
  1 files changed, 6 insertions(+), 0 deletions(-)


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