[kaffe] warnings cleanup for amd64

[Eric Anholt]

Seeing only one regression failure on FreeBSD/amd64 (GCTest, which fails
100% of the time), I went on another warnings cleanup spree.  No
improvement in regressions, but fewer warnings as a result.  It's mostly
type cleanups, but there's one uninitialized variable fix to jni.c which
looks important, and I think I set the correct initial value for it.

-- 
Eric Anholt                                     eta at lclark.edu
http://people.freebsd.org/~anholt/              anholt at FreeBSD.org
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