thread*.c: avoid unnecessary initialization for list_for_each_safe

According to r52446, it is only necessary for the current item (@i),
not the `@nxt` parameter for list_for_each_safe.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64486 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 4 insertions, 5 deletions

diff --git a/thread.c b/thread.c
index 51710d24a7..6065593712 100644
--- a/thread.c
+++ b/thread.c
@@ -2332,8 +2332,7 @@ int
 rb_notify_fd_close(int fd, struct list_head *busy)
 {
     rb_vm_t *vm = GET_THREAD()->vm;
-    struct waiting_fd *wfd = 0;
-    struct waiting_fd *next = 0;
+    struct waiting_fd *wfd = 0, *next;
 
     list_for_each_safe(&vm->waiting_fds, wfd, next, wfd_node) {
 	if (wfd->fd == fd) {
diff --git a/thread_sync.c b/thread_sync.c
index 7beee95910..5adb97f6b2 100644
--- a/thread_sync.c
+++ b/thread_sync.c
@@ -15,7 +15,7 @@ struct sync_waiter {
 static int
 wakeup_one(struct list_head *head)
 {
-    struct sync_waiter *cur = 0, *next = 0;
+    struct sync_waiter *cur = 0, *next;
 
     list_for_each_safe(head, cur, next, node) {
 	list_del_init(&cur->node);
@@ -31,7 +31,7 @@ wakeup_one(struct list_head *head)
 static void
 wakeup_all(struct list_head *head)
 {
-    struct sync_waiter *cur = 0, *next = 0;
+    struct sync_waiter *cur = 0, *next;
 
     list_for_each_safe(head, cur, next, node) {
 	list_del_init(&cur->node);
@@ -347,7 +347,7 @@ rb_mutex_unlock_th(rb_mutex_t *mutex, rb_thread_t *th)
 	err = "Attempt to unlock a mutex which is locked by another thread";
     }
     else {
-	struct sync_waiter *cur = 0, *next = 0;
+	struct sync_waiter *cur = 0, *next;
 	rb_mutex_t **th_mutex = &th->keeping_mutexes;
 
 	mutex->th = 0;