Nitpicking: small correction to the "Creating a Portable User API" chapter

[Alexey Neyman <alex.neyman@xxxxxxxxx>]

Hello,

a small correction to the example code in the "userapi" chapter on your site: 
the read() function shall not update the [per-thread] errno value if it is 
successful. That is, the example code better looked like below. And I am not 
sure about the necessity to set msg->result to -1 in case of errors 
(shouldn't it be returned from the kernel just as in the case of successful 
read?):

	error = lwkt_domsg(&syscall_port, msg);
	if (error) {
		curthread->td_errno = error;
		msg->result = -1;
	}
	return(msg->result);

Regards,
Alexey.

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