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The strdup calls were a leftover that slipped through the cleanup in
r1577.

Found-by: Valgrind 3.10.0

Corresponding to flashrom svn r1854.
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>