read_branches_file: plug a FILE* leak
The earlier rewrite f28e3ab2 (read_branches_file: simplify string handling) of read_branches_file() lost an fclose() call. Put it back. As on Windows files that are open cannot be removed, the leak manifests in a failure of 'git remote rename origin origin' when the remote's URL is specified in .git/branches/origin, because by the time that the command attempts to remove this file, it is still open. Signed-off-by: NJohannes Sixt <j6t@kdbg.org> Acked-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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