blame: prevent a segv when -L given start > EOF
blame would segv if given -L <lineno> with <lineno> past the end of the file. While we're fixing the bug, add test cases for an invalid <start> when called as -L <start>,<end> or -L<start>. Signed-off-by: NJay Soffian <jaysoffian@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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