fix SPIFFS_readdir setting errno to SPIFFS_VIS_END at the end of iteration #288
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When iteration finishes,
spiffs_obj_lu_find_entry_visitor
returnsSPIFFS_VIS_END
. Previously,SPIFFS_readdir
function used to seterrno
to this internal error value when readdir reached the end.Handle this case and add a check into the regression test.
(Original issue: esp-rs/rust#117 (comment))