Fix verification operation.

I broke this in r1702 where I enabled avoidance of the verification step if
we did not modify anything in the erase/write step. The problem is that
all_skipped is initialized to true and hence it would only ever verify if
there have been changes noted in the erase/write step. This obviously
breaks the verification operation (-v/--verify) because there we never
enter the erase/write loop.

The better alternative would be to enable (the implicit) verification
in the write loop and not in cli_classic.c. This would require a bigger
change due to the existance of dont_verify_it. Eventually this is the
right thing to do but not so shortly before a release.

Signed-off-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

git-svn-id: svn://coreboot.org/flashrom/trunk@1707 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1