multiple calls to g_io_channel_read_line and g_free question

[Colossus <colossus 3000 it>]

Hi,

I have a doubt. I call g_io_channel_read_line several times this way:

g_io_channel_read_line ( ioc, &line, NULL, NULL, NULL );
//do some things on line
//shall I g_free (line) here ?
g_io_channel_read_line ( ioc, &line, NULL, NULL, NULL );
//ecc

My doubt is: shall I free line before the second call to 
g_io_channel_read_line or I can call g_free ONCE when I don't need to 
read anymore ?

Thank you,
--
Colossus
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