busybox

sv: fix "sv o SRV; ...; sv d SRV" (bug 461) + code shrink

function                                             old     new   delta
status                                               120     118      -2
control                                              159     126     -33
sv_main                                             1222    1183     -39

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