[InterNetNews/inn] 114e2e: Add casts to new bio_dump_cb

[Russ Allbery]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 114e2ea26736b908b265292ce38c069fe9bb01bb
      https://github.com/InterNetNews/inn/commit/114e2ea26736b908b265292ce38c069fe9bb01bb
  Author: Russ Allbery <eagle at eyrie.org>
  Date:   2021-10-03 (Sun, 03 Oct 2021)

  Changed paths:
    M nnrpd/tls.c

  Log Message:
  -----------
  Add casts to new bio_dump_cb

Some of the types weren't compatible on 32-bit architectures.