Compiler warning fixes.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37277 a95241bf-73f2-0310-859d-f6bbb57e9c96

patch by Fredrik Modéen:
* extensive code cleanup
* small additional clean ups by myself


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22716 a95241bf-73f2-0310-859d-f6bbb57e9c96