strbuf: avoid calling strbuf_grow() twice in strbuf_addbuf()
Implement strbuf_addbuf() as a normal function in order to avoid calling strbuf_grow() twice, with the second callinside strbud_add() being a no-op. This is slightly faster and also reduces the text size a bit. Signed-off-by: NRene Scharfe <l.s.r@web.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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