Fix crash when processing a wayland client cursor set after death
Fix crash when processing a wayland client cursor set after death

It looks like the only way we can get here with NULL resource data
is when we explicitly cleared it in the del hook, meaning the client
is dead to us.  In this case it's ok to ignore the cursor set request.

ref T4988

tasn/enlightenment,tasn/enlightenment,tasn/enlightenment