[Bug 245342] adduser.sh silently sets a password different from the input if it contains leading/trailing spaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245342

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kevans
Date: Sun Apr  5 19:25:46 UTC 2020
New revision: 359642
URL: https://svnweb.freebsd.org/changeset/base/359642

Log:
  adduser: allow standard IFS characters in passwords

  Notably, the default IFS contains space/tab, thus any leading/trailing
  whitespace characters tend to be removed.

  Set IFS= for just the read lines to mitigate this, allowing the user to be
  less surprised when their leading/trailing spaces weren't actually captured
  in the password as they are with other means of setting a user's password.

  PR:           245342
  Submitted by: dereks_lifeofadishwasher.com
  Reviewed by:  jilles
  MFC after:    1 week
  Differential Revision:        https://reviews.freebsd.org/D24292

Changes:
  head/usr.sbin/adduser/adduser.sh

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