[core] remove bad prototype from algo_splaytree.h
@@ -14,7 +14,6 @@ typedef struct tree_node {
splay_tree * splaytree_splay (splay_tree *t, int key);
splay_tree * splaytree_insert(splay_tree *t, int key, void *data);
splay_tree * splaytree_delete(splay_tree *t, int key);
-splay_tree * splaytree_size(splay_tree *t);
#define splaytree_size(x) (((x)==NULL) ? 0 : ((x)->size))
/* This macro returns the size of a node. Unlike "x->size", */
