elm_disselector.c: removed redundant code.
elm_disselector.c: removed redundant code.

This fixes 'dereference before null check' issue which was spotted by coverity. CID 1040001.

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