Finish removing die() calls from ref-filter formatting logic,
so that it could be used by other commands.
Change the signature of get_ref_atom_value() and underlying functions
by adding return value and strbuf parameter for error message.
Return value equals 0 upon success and -1 upon failure.
Upon failure, error message is appended to the strbuf.
Signed-off-by: Olga Telezhnaia <olyatelezhnaya@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>