xfs: Calling destroy_work_on_stack() to pair with INIT_WORK_ONSTACK()

In case CONFIG_DEBUG_OBJECTS_WORK is defined, it is needed to
call destroy_work_on_stack() which frees the debug object to pair
with INIT_WORK_ONSTACK().

Signed-off-by: Liu, Chuansheng <[e-mail]>
Reviewed-by: Ben Myers <[e-mail]>
Signed-off-by: Ben Myers <[e-mail]>

(cherry picked from commit 6f96b3063cdd473c68664a190524ed966ac0cd92)

fs/xfs/xfs_bmap_util.c

···
 	INIT_WORK_ONSTACK(&args->work, xfs_bmapi_allocate_worker);
 	queue_work(xfs_alloc_wq, &args->work);
 	wait_for_completion(&done);
+	destroy_work_on_stack(&args->work);
 	return args->result;
 }