drm/sched: Move free worker re-queuing out of the if block

Whether or not there are more jobs to clean up does not depend on the
existance of the current job, given both drm_sched_get_finished_job and
drm_sched_free_job_queue_if_done take and drop the job list lock.
Therefore it is confusing to make it read like there is a dependency.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Luben Tuikov <ltuikov89@gmail.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231102105538.391648-3-tvrtko.ursulin@linux.intel.com
Reviewed-by: Luben Tuikov <ltuikov89@gmail.com>
Signed-off-by: Luben Tuikov <ltuikov89@gmail.com>