[Bug 230589] periodic scripts generate spurious emails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230589

            Bug ID: 230589
           Summary: periodic scripts generate spurious emails
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: conf
          Assignee: bugs at FreeBSD.org
          Reporter: topical at gmx.net

Created attachment 196152
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=196152&action=edit
Make "check_diff new_only" not generate spurious emails

Many periodic scripts check log files and generate an email if there is
something new.

Often, you receive spurious emails like this:

> myhost kernel log messages:
>  
> -- End of security output --

Obviously, there are no log messages to report.

Reason is a logic error in "check_diff new_only" which should generates a
message only if there are new lines in given log. Unfortunately, a message is
also generated if there are __removed__ lines, even though those removed lines
are not shown (and not meant to be shown).

I've attached a fix.

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