shell32: Ensure extraPmts is a valid pointer before checking it

[Owen Rudge]

Silly mistake in one of my last patches - didn't check that extraPmts in 
control.c actually pointed to something, resulting in bug 19411. This 
patch fixes that.

---
  dlls/shell32/control.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

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