The free routine pointer was renamed to free_func to avoid collisions
with the standard C free() function.
From Jeff Morris' abandoned change Ia3810fe228b497d888d825f8b606078e2f71be65.
Change-Id: Iedeb74625b13d1097da510487b60f38861a42bec
Reviewed-on: https://code.wireshark.org/review/15666
Reviewed-by: Guy Harris <guy@alum.mit.edu>