fix uninitialized name_list error::ignore_error

fix uninitialized name_list error::ignore_error

Running udevd under valgrind (and then udevtrigger):

==17705== Conditional jump or move depends on uninitialised value(s)
==17705==    at 0x407BBB: udev_rules_run (udev_rules.c:522)
==17705==    by 0x4109F0: udev_event_process (udevd.c:145)
==17705==    by 0x410E2C: udev_event_run (udevd.c:251)
==17705==    by 0x411A8D: msg_queue_manager (udevd.c:581)
==17705==    by 0x41386B: main (udevd.c:1284)

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>