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Not only does this violate the principle of least surprise, it also
caused one bug where -Ewv was specified and the flash ended up being
empty.

Support only one operation at a time. As a side benefit, this allows us
to clean up main() quite a bit.

Corresponding to flashrom svn r585.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>