Merge branch 'js/wait-or-whine-can-fail'

We used to log an error return from wait_or_whine() as process
termination of the waited child, which was incorrect.

* js/wait-or-whine-can-fail:
  run-command: don't spam trace2_child_exit()

run-command.c

@@ -984,7 +984,8 @@ int finish_command(struct child_process *cmd)
 int finish_command_in_signal(struct child_process *cmd)
 {
 	int ret = wait_or_whine(cmd->pid, cmd->args.v[0], 1);
-	trace2_child_exit(cmd, ret);
+	if (ret != -1)
+		trace2_child_exit(cmd, ret);
 	return ret;
 }