drm/sched: Warn if pending_list is not empty
drm_sched_fini() can leak jobs under certain circumstances.
Warn if that happens.
Acked-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://lore.kernel.org/r/20250710125412.128476-7-phasta@kernel.org