perf rblist: Create rblist__exit() function

Currently we have a rblist__delete() which is used to delete a rblist.
While rblist__delete() will free the pointer of rblist at the end.

It's an inconvenience for the user to delete a rblist which is not
allocated by something like malloc(). For example, the rblist is
embedded in a larger data structure.

This patch creates a new function rblist__exit() which is similar to
rblist__delete() but it will not free the pointer of rblist.
Signed-off-by: NJin Yao <yao.jin@linux.intel.com>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1512125856-22056-2-git-send-email-yao.jin@linux.intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/rblist.c

@@ -101,9 +101,8 @@ void rblist__init(struct rblist *rblist)
 	return;
 }
 
-void rblist__delete(struct rblist *rblist)
+void rblist__exit(struct rblist *rblist)
 {
-	if (rblist != NULL) {
 	struct rb_node *pos, *next = rb_first(&rblist->entries);
 
 	while (next) {
@@ -111,6 +110,12 @@ void rblist__delete(struct rblist *rblist)
 		next = rb_next(pos);
 		rblist__remove_node(rblist, pos);
 	}
+}
+
+void rblist__delete(struct rblist *rblist)
+{
+	if (rblist != NULL) {
+		rblist__exit(rblist);
 		free(rblist);
 	}
 }

tools/perf/util/rblist.h

@@ -29,6 +29,7 @@ struct rblist {
 };
 
 void rblist__init(struct rblist *rblist);
+void rblist__exit(struct rblist *rblist);
 void rblist__delete(struct rblist *rblist);
 int rblist__add_node(struct rblist *rblist, const void *new_entry);
 void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node);