elm_thumb.c: fix build warning in case without ethumb
elm_thumb.c: fix build warning in case without ethumb


SVN revision: 67744

rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary