improve linked-list macros in two ways:

- the *_CURRENT macros no longer need the list head pointer argument
  - add AST_LIST_MOVE_CURRENT to encapsulate the remove/add operation when moving entries between lists


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89106 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_speech.c

@@ -317,7 +317,7 @@ int ast_speech_unregister(char *engine_name)
 	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&engines, engine, list) {
 		if (!strcasecmp(engine->name, engine_name)) {
 			/* We have our engine... removed it */
-			AST_RWLIST_REMOVE_CURRENT(&engines, list);
+			AST_RWLIST_REMOVE_CURRENT(list);
 			/* If this was the default engine, we need to pick a new one */
 			if (!default_engine)
 				default_engine = AST_RWLIST_FIRST(&engines);
@@ -327,7 +327,7 @@ int ast_speech_unregister(char *engine_name)
 			break;
 		}
 	}
-	AST_RWLIST_TRAVERSE_SAFE_END
+	AST_RWLIST_TRAVERSE_SAFE_END;
 	AST_RWLIST_UNLOCK(&engines);
 
 	return res;