[AD] Fix for strange fb_init bug

[Grzegorz Adam Hankiewicz <gradha@xxxxxxxxxx>]

Hi.

As reported in todo.txt, fb_init seemed to hang when user selects exotic
resolutions like 777x777 or such. The problem was that fbcon.c's get_line
was flaky, and could read wrong values out of the file. This triggered
some signal (I didn't bother checking which one) which started calling
linux/lsystem.c recursively. The console seemed blocked because the
program is raising the same signal again and again without being able to
do anything else.

So I rewrote that function and it works. I hope it's solid enough to
process any file existant file, at least I can't see anything wrong with
it. You can remove the todo.txt entry.

Now it's fun to watch things run in 777x777. IIRC now vesafb users could
run lowres programs without resolution switch as long as they have the
same color depth as the requested resolution, but I am too lazy to boot
and veryfy this :-)

PD: Are there any files which could be rewritten with GNU extensions?

 Grzegorz Adam Hankiewicz   gradha@xxxxxxxxxx   http://gradha.infierno.org

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