main/manager.c: Bugfix sort action_manager by alphabetically

Fix the alphabetic order added on ast_manager_register_struct. The order
for struct manager_action added is not working, this change fixes the
problem.

Change-Id: I149da0cd06c3c4445d7516cc303358e9f26f8b4b

main/manager.c

@@ -6781,9 +6781,9 @@ static int ast_manager_register_struct(struct manager_action *act)
 			return -1;
 		}
 		if (ret > 0) { /* Insert these alphabetically */
-			prev = cur;
 			break;
 		}
+		prev = cur;
 	}
 
 	ao2_t_ref(act, +1, "action object added to list");