[Midnightbsd-cvs] [MidnightBSD/src] d9989e: fix return val checks in diff

[Lucas Holt]

  Branch: refs/heads/master
  Home:   https://github.com/MidnightBSD/src
  Commit: d9989efeeadc802424beab9829d3ba54b8653336
      https://github.com/MidnightBSD/src/commit/d9989efeeadc802424beab9829d3ba54b8653336
  Author: Lucas Holt <luke at foolishgames.com>
  Date:   2020-11-22 (Sun, 22 Nov 2020)

  Changed paths:
    M usr.bin/diff/diff.c
    M usr.bin/diff/diffreg.c
    M usr.bin/diff/xmalloc.c

  Log Message:
  -----------
  fix return val checks in diff