Keep "git --git-dir" from causing a bus error.
The option checking code for --git-dir had an off by 1 error that would cause it to access uninitialized memory if it was the last argument. This causes it to display an error and display the usage string instead. Signed-off-by: NBrian Gernhardt <benji@silverinsanity.com> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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