criu: don't return negative values from main() 1/2

We should return 1 not -1, because -1 becomes 255.

>From man bash: "the shell may use values above
125 specially". Don't be a black sheep and return 1.

This is first part, patching obvious direct return statements.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>