ftpd: optimize writes of LIST results a bit

function                                             old     new   delta
handle_dir_common                                    201     207      +6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
awk: fix handling of "if ... break ; else ..." - closes 7226

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>