fetch-gnu.sh: Update csplit-io-err

Author: oech3

util/fetch-gnu.sh

@@ -7,5 +7,6 @@ curl -L "${repo}/releases/download/v${ver}/coreutils-${ver}.tar.xz" | tar --stri
 curl -L ${repo}/raw/refs/heads/master/tests/mv/hardlink-case.sh > tests/mv/hardlink-case.sh
 curl -L ${repo}/raw/refs/heads/master/tests/mkdir/writable-under-readonly.sh > tests/mkdir/writable-under-readonly.sh
 curl -L ${repo}/raw/refs/heads/master/tests/cp/cp-mv-enotsup-xattr.sh > tests/cp/cp-mv-enotsup-xattr.sh #spell-checker:disable-line
-# Avoid incorrectly passing runcon-compute 
+curl -L ${repo}/raw/refs/heads/master/tests/csplit/csplit-io-err.sh > tests/csplit/csplit-io-err.sh
+# Avoid incorrect PASS
 curl -L ${repo}/raw/refs/heads/master/tests/runcon/runcon-compute.sh > tests/runcon/runcon-compute.sh