cvsserver: Don't send mixed messages to clients

After we send I HATE YOU we should probably exit and not happily
continue with I LOVE YOU and further communication.

Most clients will probably just exit and ignore everything we
send after the I HATE YOU and it is not a security problem
either because we don't really care about the user name anyway.

But it is still the right thing to do.

[jc: with a minor fixup to its exit code...]

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Acked-by: "Martin Langhoff" <martin.langhoff@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-cvsserver.perl

@@ -105,6 +105,7 @@
     unless ($line eq 'anonymous') {
        print "E Only anonymous user allowed via pserver\n";
        print "I HATE YOU\n";
+       exit;
     }
     $line = <STDIN>; chomp $line;    # validate the password?
     $line = <STDIN>; chomp $line;