start-stop-daemon: Fix -x is not required for -K

Commit 088fec36fedff2cd50437c95b7fb430abf8d303c made -x required for
all. However it isn't for -K.

function                                             old     new   delta
start_stop_daemon_main                              1084    1105     +21
packed_usage                                       33343   33326     -17
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 21/-17)              Total: 4 bytes

Signed-off-by: Alexander Vickberg <wickbergster@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed