[Bug 202022] bsdgrep -f crash with null pattern

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202022

            Bug ID: 202022
           Summary: bsdgrep -f crash with null pattern
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kcwu at csie.org

How to repeat:
$ printf "\0" > nul
$ bsdgrep -f nul /COPYRIGHT
Segmentation fault (core dumped)

According to
http://pubs.opengroup.org/onlinepubs/9699919799/functions/getdelim.html
"Although a NUL terminator is always supplied after the line, note that
strlen(*lineptr) will be smaller than the return value if the line contains
embedded NUL characters."

bsdgrep didn't handle embedded NULL characters inside the pattern.

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