greybus: operation: free resources in the reverse order of allocation

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/operation.c

@@ -493,8 +493,8 @@ int gb_operation_init(void)
 
 void gb_operation_exit(void)
 {
-	kmem_cache_destroy(gb_operation_cache);
-	gb_operation_cache = NULL;
 	destroy_workqueue(gb_operation_recv_workqueue);
 	gb_operation_recv_workqueue = NULL;
+	kmem_cache_destroy(gb_operation_cache);
+	gb_operation_cache = NULL;
 }