Correct usage of g_read_data() API

[Poul-Henning Kamp]

In message <438C3672.1010700 at portaone.com>, Maxim Sobolev writes:

>--- 3 ---
>error = random();
>data = g_read_data(..., &error);
>if (buf == NULL)
>	handle_error(error);
>---------

This is the correct way.

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