[Chicken-hackers] Fix

[Moritz Heidkamp]

Hi everyone,

char-ready? on string input ports would return #f when they've reached
the end of their underlying string. However, char-ready? is supposed to
return #t in this case. The attached patch fixes this and adds a
corresponding regression test. It applies to both master and chicken-5.

Cheers
Moritz

0001-Fix-char-ready-on-EOF-for-string-input-ports.patch
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