tm: warn in case of transaction is not suspended by a continue is attempted

modules/tm/t_suspend.c

@@ -178,7 +178,7 @@ int t_continue(unsigned int hash_index, unsigned int label,
 	}
 
 	if (!(t->flags & T_ASYNC_SUSPENDED)) {
-		LM_ERR("transaction is not suspended [%u:%u]\n", hash_index, label);
+		LM_WARN("transaction is not suspended [%u:%u]\n", hash_index, label);
 		return -2;
 	}