comctl32: Fix possible use of uninitialised variable in REBAR_Paint.

[Robert Shearman]

In the case where an hdc is passed in via the wParam, ps.fErase could be 
uninitialised. Fix this by rearranging the code so that ps is only used 
when an hdc isn't passed in.
---
  dlls/comctl32/rebar.c |   29 ++++++++++++++---------------
  1 files changed, 14 insertions(+), 15 deletions(-)
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