[patch] fix another End keypress lockup in the viewer

[Roland Illig]

Jindrich Makovicka wrote:
> Hello,
> 
> the new viewer has a problem with viewing files with DOS line
> separators, which manifests again in a lockup after pressing the End
> key. Then, it is impossible to move the view further, except by pressing
> the Home key.

Can you provide a file where that lockup occurs? As always, I cannot 
reproduce the bug. But I have found another bug in the coordinate cache 
code. Opening the attached file and running mc_ccache_dump() results in 
an endless loop. I will first fix this one, perhaps it fixes your bug, too.

Roland
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