config.c: mark file-local function static
Commit 7192777d refactors git_parse_ulong, which is public, into a more generic function. But since we kept the git_parse_ulong wrapper, only that part needs to be public; nobody outside the file calls the lower-level git_parse_unsigned. Noticed with sparse. ("'git_parse_unsigned' was not declared. Should it be static?") Signed-off-by: NRamsay Jones <ramsay@ramsay1.demon.co.uk> Explained-by: NJeff King <peff@peff.net> Signed-off-by: NJonathan Nieder <jrnieder@gmail.com>
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