Various static checker fixes

[Andi Kleen]

I was playing around with LLVM's static checker. Here are some fixes
from reviewing the output on a kernel build.

Some merely shut up the checker -- it is technically right, but
the problem is not a real bug as far as I can tell. Still it's
cleaner/clearer to avoid uninitialized variables and similar.

A few others are real bugs.

-Andi

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