elm_map: Fix compilation warning/error
elm_map: Fix compilation warning/error

ELM_WIDGET_DATA_GET_OR_RETURN can take a VA_ARGS if the function
should return something.

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