elm_interface_scrollable.c: initialize more local variables spotted by valgrind.
elm_interface_scrollable.c: initialize more local variables spotted by valgrind.

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