possible error in tutorial in manual. foreign-string-to-lisp missing :count keyword

[BenAnhalt]

While working through the tutorial, the steps at the end of section 4.9 "Calling Lisp from C" were failing. I found that changing the call to foreign-string-to-lisp in the easy-write callback from (foreign-string-to-lisp ptr data-size nil) to (foreign-string-to-lisp ptr :count data-size) allowed the example to work.

[Luís Oliveira (luismbo)]

Oops. FTR, it'd be nice to put the tutorial code in a test file (possibly with mock code in libtest.so so we don't have to depend on libcurl, not sure) so that we catch bitrot there.