rbtree: remove unused arguments from INIT macro.

docs/technical/rbtree.txt

@@ -9,10 +9,10 @@ Initialize a `rbtree` structure. +
 should only be used with the declaration like:
 +
 ----
-rbtree tree = RBTREE_INIT(...);
+rbtree tree = RBTREE_INIT(cmp);
 ----
 +
-the arguments are pointers to callback functions, in order: `delete_fn`, `update_fn`, `cmp_fn`
+will expand to set the compare function 'cmp' to the `cmp_fn` member.
 
 Data structures
 ~~~~~~~~~~~~~~~

src/inotify-map.c

@@ -31,8 +31,8 @@ static void wd_free(void *ptr);
 static int wd_cmp(const void *a, const void *b);
 static int path_cmp(const void *a, const void *b);
 
-static rbtree tree_wd_paths = RBTREE_INIT(wd_free, NULL, wd_cmp);
+static rbtree tree_wd_paths = RBTREE_INIT(wd_cmp);
-static rbtree tree_path_wd = RBTREE_INIT(xfree, NULL, path_cmp);
+static rbtree tree_path_wd = RBTREE_INIT(path_cmp);
 
 static int wd_cmp(const void *a, const void *b) {
 

src/rbtree.h

@@ -19,7 +19,7 @@ typedef struct {
     int  (*cmp_fn)(const void *, const void *);
 } rbtree;
 
-#define RBTREE_INIT(delete, update, cmp) { NULL, cmp }
+#define RBTREE_INIT(cmp) { NULL, cmp }
 
 int rbtree_is_empty(rbtree *tree);
 

test/t_rbtree.c

@@ -12,7 +12,7 @@ static int vcmp(const void *a, const void *b);
 static void vdelete(void *ptr);
 
 /* data */
-static rbtree tree = RBTREE_INIT(NULL, NULL, vcmp);
+static rbtree tree = RBTREE_INIT(vcmp);
 static int   keyref[NODES];
 
 static int vcmp(const void *a, const void *b) {