textconv: refactor calls to run_textconv
This patch adds a fill_textconv wrapper, which centralizes some minor logic like error checking and handling the case of no-textconv. In addition to dropping the number of lines, this will make it easier in future patches to handle multiple types of textconv. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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