ensure fwin efm delete callback does not trigger crash
ensure fwin efm delete callback does not trigger crash

if this is called during fwin delete, dereferencing the passed data
will result in a crash

rvandegrift/e,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,rvandegrift/e,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment