make checksum unsigned -> make camera work.
make checksum unsigned -> make camera work.


git-svn-id: 40dd595c6684d839db675001a64203a1457e7319@11848 67ed7778-7388-44ab-90cf-0a291f65f57c

gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION