drm/amdkfd: Cleanup workqueue during module unload

Destroy the high priority workqueue that handles interrupts
during KFD node cleanup.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c

@@ -104,6 +104,8 @@ void kfd_interrupt_exit(struct kfd_node *node)
 	 */
 	flush_workqueue(node->ih_wq);
 
+	destroy_workqueue(node->ih_wq);
+
 	kfifo_free(&node->ih_fifo);
 }