[Bug 223177] ipfw table delete returns non-zero exit status even with -q option specified

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223177

            Bug ID: 223177
           Summary: ipfw table delete returns non-zero exit status even
                    with -q option specified
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: abuse at f-t-w.wtf

Behaviour of 'ipfw -q table 1 delete 1.2.3.4' changed between 10.3-RELEASE and
11.1-RELEASE. In 11.1, the -q option is apparently ignored and an attempt to
delete a nonexistent entry from the table returns an error message and non-zero
exit status.  In 10.3, the -q option suppressed the error message and always
returned a zero exit status.   This change breaks makefiles and shell scripts
that depended on the exit status being zero and no error output always.

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