[comctl32/header] Check Null before accessing structmember (Coverity)

[Paul Vriens]

Hi,

we use a structmember before we checked for NULL. I haven't checked if
it's even remotely possible to pass a NULL pointer but the code seems a
bit cleaner now. It should also satisfy Coverity (cid 849), although
that's not a goal in itself.

Changelog
  Check for NULL pointer before accessing structmember

Cheers,

Paul.
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