[Bug 192528] pwd_mkdb fails if /etc/shells contains duplicates

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192528

--- Comment #8 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Mon May 15 17:57:09 UTC 2017
New revision: 318304
URL: https://svnweb.freebsd.org/changeset/base/318304

Log:
  getusershell: don't write past end of line buffer reading local shells

  _local_initshells did not reset cp to the beginning of the line buffer
  for every iteration that it called fgets(3), leading to writing past the
  end of line with fairly long /etc/shells or excessively long line
  lengths. Correct this by properly resetting cp.

  PR:           192528
  Submitted by: Kyle Evans <kevans91 at ksu.edu>
  Reviewed by:  cem, jilles
  Differential Revision:        https://reviews.freebsd.org/D10690

Changes:
  head/lib/libc/gen/getusershell.c

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