The 'unsigned int(expression)' syntax is *not* correct, says
http://en.cppreference.com/w/cpp/language/explicit_cast, but
apparently MSVC and gcc don't mind. Clang doesn't like it, though.
Re-introduce kendy's change but use static_cast instead of functional
cast.

This reverts commit 33d2475d

Change-Id: I799cce13e9bebf1a375243c294c4fa8788502ec6