[Bug 223560] man(1) hangs for uncompressed catpages

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223560

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

Author: bapt
Date: Mon Dec  4 12:33:46 UTC 2017
New revision: 326526
URL: https://svnweb.freebsd.org/changeset/base/326526

Log:
  In case man(1) found a catpage to display skip looking ".so" which is manpage
  only.

  In case we are trying to read a catpage, the manpage variable is not defined.
  It results in the "cattool" having no arguments.

  In case the catpage is compressed, the cattool used is "zcat" which dies if
the
  standard input is a terminal, meaning the function calling it is exiting as
if
  there were no ".so"
  In case the catpage is uncompressed, the cattool used is "zcat -f" which
waits
  reading standard input, making the man(1) command hang.

  PR:           223560
  Reported by:  wosch
  MFC after:    3 days

Changes:
  head/usr.bin/man/man.sh

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