Constify dediprog's write functions too

I forgot doing so in r1789 which broke compiling the dediprog module with
-Werror (which is default). Thanks to Mike Hibbett for reporting this.

Corresponding to flashrom svn r1797.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
1 file changed