Replace some calls to die(usage_str) with usage(usage_str).
The only change in behaviour should be having a "usage: " prefix on the output string rather than "fatal: ", and an exit code of 129 rather than 128. Signed-off-by: NRamsay Allan Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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