get rid of ->scm_work_list

recursion in __scm_destroy() will be cut by delaying final fput()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

include/linux/sched.h

@@ -1546,7 +1546,6 @@ struct task_struct {
 	unsigned long timer_slack_ns;
 	unsigned long default_timer_slack_ns;
 
-	struct list_head	*scm_work_list;
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	/* Index of current stored address in ret_stack */
 	int curr_ret_stack;

include/net/scm.h

@@ -13,7 +13,6 @@
 #define SCM_MAX_FD	253
 
 struct scm_fp_list {
-	struct list_head	list;
 	short			count;
 	short			max;
 	struct file		*fp[SCM_MAX_FD];

net/core/scm.c

@@ -109,26 +109,10 @@ void __scm_destroy(struct scm_cookie *scm)
 
 	if (fpl) {
 		scm->fp = NULL;
-		if (current->scm_work_list) {
-			list_add_tail(&fpl->list, current->scm_work_list);
-		} else {
-			LIST_HEAD(work_list);
-
-			current->scm_work_list = &work_list;
-
-			list_add(&fpl->list, &work_list);
-			while (!list_empty(&work_list)) {
-				fpl = list_first_entry(&work_list, struct scm_fp_list, list);
-
-				list_del(&fpl->list);
 		for (i=fpl->count-1; i>=0; i--)
 			fput(fpl->fp[i]);
 		kfree(fpl);
 	}
-
-			current->scm_work_list = NULL;
-		}
-	}
 }
 EXPORT_SYMBOL(__scm_destroy);