Fix using uninitialized memory.

git-svn-id: https://peerblock.googlecode.com/svn/trunk@639 d3e0e2f6-51e0-11de-b413-c5e99dc0a8e2
installer: rename a few variables, simplify code.

git-svn-id: https://peerblock.googlecode.com/svn/trunk@640 d3e0e2f6-51e0-11de-b413-c5e99dc0a8e2