Eliminate uninitialized variable warnings in kernel and module builds when
building with gcc 4.2

This has been requested several times over the past few months by several
people (including me), because gcc 4.2 just gets it wrong too often. It's
causing us to litter the code with lots of bogus initializers just to
squelch the warnings. We still have clang and coverity telling us about
uninitialized variables, and they do so more accurately.