use -Wextra and fix the warnings it caused
authorRalf Jung <post@ralfj.de>
Fri, 27 Sep 2013 11:05:27 +0000 (13:05 +0200)
committerRalf Jung <post@ralfj.de>
Fri, 27 Sep 2013 11:05:27 +0000 (13:05 +0200)

No differences found