allow netsock objects to be unref'd so they can disappear when needed (issue #5454)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6913 65c4cc65-6c06-0410-ace0-fbb531ad65f3

netsock.c

@@ -214,3 +214,8 @@ void *ast_netsock_data(const struct ast_netsock *ns)
 {
 	return ns->data;
 }
+
+void ast_netsock_unref(struct ast_netsock *ns)
+{
+	ASTOBJ_UNREF(ns, ast_netsock_destroy);
+}