diff: remove dead code
When `len < 1`, len has to be 0 or negative, emit_line will then remove the first character and by then `len` would be negative. As this doesn't happen, it is safe to assume it is dead code. This continues to simplify the code, which was started in b8d9c1a6 (2009-09-03, diff.c: the builtin_diff() deals with only two-file comparison). Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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