prompt: clean up strbuf usage
The do_askpass function inherited a few bad habits from the original git_getpass. One, there's no need to strbuf_reset a buffer which was just initialized. And two, it's a good habit to use strbuf_detach to claim ownership of a buffer's string (even though in this case the owning buffer goes out of scope, so it's effectively the same thing). Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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