winhlp32: Ensure win->page is not NULL when selecting Help on Help

[Owen Rudge]

This patch fixes bug 15367, where winhlp32 would crash if Help on Help 
was selected with no help file loaded. It adds a check in MACRO_HelpOn 
to ensure the reference to the current page is valid.

---
  programs/winhlp32/macro.c |    7 +++++--
  1 files changed, 5 insertions(+), 2 deletions(-)

-- 
Owen Rudge
http://www.owenrudge.net/
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