minor whitespace cleanups

Signed-off-by: Enrico Scholz <enrico.scholz@ensc.de>
fixed chroot() code

Signed-off-by: Enrico Scholz <enrico.scholz@ensc.de>
logging: avoid -Wunused-result warnings

Signed-off-by: Enrico Scholz <enrico.scholz@ensc.de>
source: avoid -Wunused-result warnings

Signed-off-by: Enrico Scholz <enrico.scholz@ensc.de>
build with _FORTIFY_SOURCE

Signed-off-by: Enrico Scholz <enrico.scholz@ensc.de>
.gitignore: updated

Signed-off-by: Enrico Scholz <enrico.scholz@ensc.de>