Add type cast to `readline(2)` return value.
MODIFY
mrbgems/mruby-io/src/file.c
mrbgems/mruby-io/src/file.c
@@ -370,7 +370,7 @@ mrb_file_s_readlink(mrb_state *mrb, mrb_value klass) {
mrb_get_args(mrb, "z", &path);
buf = (char *)mrb_malloc(mrb, bufsize);
- while ((rc = readlink(path, buf, bufsize)) == bufsize && rc != -1) {
+ while ((rc = readlink(path, buf, bufsize)) == (ssize_t)bufsize && rc != -1) {
bufsize *= 2;
buf = (char *)mrb_realloc(mrb, buf, bufsize);
}

Add type cast to `readline(2)` return value.