[Bug 243975] diff(1) should print the usage information when two different formatting options are used at the same time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243975

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kevans
Date: Mon Apr 20 16:14:45 UTC 2020
New revision: 360125
URL: https://svnweb.freebsd.org/changeset/base/360125

Log:
  diff(1): reject conflicting formatting options

  This matches GNU diff(1) behavior and, more importantly, eliminates any
  source of confusion if multiple formatting options are specified.

  Note that the committed diff differs slightly from the submitted: I've
  modified it so that we initialize diff_format to something that isn't an
  accepted format option so that we can also reject --normal -c and -c
  --normal, which would've otherwise been accepted because the default was
  --normal. After option parsing we default it to D_NORMAL if it's still
  unset.

  PR:           243975
  Submitted by: fehmi noyan isi
  MFC after:    1 week

Changes:
  head/usr.bin/diff/diff.c
  head/usr.bin/diff/diff.h
  head/usr.bin/diff/tests/diff_test.sh

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