sbcl and uffi functions that return :pointer-void

dear uffi-devel,

I know there's been some discussion of how to avoid runtime allocation 
on SBCL for UFFI memory access, but I'm trying to declare an UFFI 
function that returns a :pointer-void and I get a warning about runtime 
allocation. Declaring the return type as :int makes the warning go 
away, but this is, of course, not the right answer. Is there a way to 
do this without the runtime allocation?

Thanks,

Cyrus