LU-10467 llite: use wait_event in cl_object_put_last()

LU-10467 llite: use wait_event in cl_object_put_last()

cl_object_put_last() contains an open-coded version
of wait_event().
Replace it with the library macro.

Change-Id: I878f76c9af24e827f91fe50fbeb637dda1489b8a
Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-on: https://review.whamcloud.com/36345
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>