parse-options: add new function "usage_msg_opt"
This function can be used instead of "usage_with_options" when you want to print an error message before the usage string. It may be useful because: if (condition) usage_msg_opt("condition is false", usage, opts); is shorter than: if (condition) { fprintf(stderr, "condition is false\n\n"); usage_with_options(usage, opts); } and may be more consistent. Signed-off-by: NChristian Couder <chriscool@tuxfamily.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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