r12116: got rid of composite_trigger_done() and composite_trigger_error(), and

instead make the normal composite_done() and composite_error()
functions automatically trigger a delayed callback if the caller has
had no opportunity to setup a async callback

this removes one of the common mistakes in writing a composite function

source/libcli/composite/composite.h

@@ -57,4 +57,6 @@ struct composite_context {
 		void (*fn)(struct composite_context *);
 		void *private_data;
 	} async;
+
+	BOOL used_wait;
 };