Fix an arg promotion handling bug in _do_one_spec for %c reported by Ilguiz Latypov <ilatypov@superbt.com>.
Fix an arg promotion handling bug in _do_one_spec for %c reported
by Ilguiz Latypov <ilatypov@superbt.com>.

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc