we release the wrong interface on config change. if the interface changed, release the old and try to claim the new first.
we release the wrong interface on config change.
if the interface changed, release the old and try to claim the new
first.


git-svn-id: 40dd595c6684d839db675001a64203a1457e7319@10086 67ed7778-7388-44ab-90cf-0a291f65f57c

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