* buffer.c (unchain_overlay): Simplify. Add comment.

* marker.c (unchain_marker): Simplify.  Fix comments.

1 files changed, 7 insertions, 8 deletions

diff --git a/src/buffer.c b/src/buffer.c
index a37a61c0fc8..a40270c945c 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -3672,18 +3672,17 @@ modify_overlay (struct buffer *buf, ptrdiff_t start, ptrdiff_t end)
   ++BUF_OVERLAY_MODIFF (buf);
 }
 
-
+/* Remove OVERLAY from LIST.  */
+
 static struct Lisp_Overlay *
 unchain_overlay (struct Lisp_Overlay *list, struct Lisp_Overlay *overlay)
 {
-  struct Lisp_Overlay *tmp, *prev;
-  for (tmp = list, prev = NULL; tmp; prev = tmp, tmp = tmp->next)
-    if (tmp == overlay)
+  register struct Lisp_Overlay *tail, **prev = &list;
+
+  for (tail = list; tail; prev = &tail->next, tail = *prev)
+    if (tail == overlay)
       {
-        if (prev)
-          prev->next = tmp->next;
-        else
-          list = tmp->next;
+        *prev = overlay->next;
         overlay->next = NULL;
         break;
       }