[rtler] minor change to port_walk() for slice debugging
[rtler] minor change to port_walk() for slice debugging

Abhinav117/pymtl,cfelton/pymtl,jck/pymtl,cornell-brg/pymtl,Abhinav117/pymtl,12yujim/pymtl,jjffryan/pymtl,cornell-brg/pymtl,Abhinav117/pymtl,jjffryan/pymtl,Abhinav117/pymtl,jck/pymtl,12yujim/pymtl,Glyfina-Fernando/pymtl,tj93/pymtl,tj93/pymtl,Glyfina-Fernando/pymtl,cornell-brg/pymtl,jjffryan/pymtl,tj93/pymtl,jck/pymtl,cfelton/pymtl,Glyfina-Fernando/pymtl,12yujim/pymtl,cfelton/pymtl