Avoid segfault in expand()
Avoid segfault in expand()

The debug fprintf in expect() was using macroname, which was
not defined in the case of symfile and symline.

k0gaMSX/kcc,k0gaMSX/scc,8l/scc,8l/scc,k0gaMSX/scc,k0gaMSX/scc,k0gaMSX/kcc,8l/scc