[coreutils] [PATCH] tests: fix a printf portability issue

[Pádraig Brady]

not all printf commands support \xhh

diff --git a/tests/misc/sort-debug-keys b/tests/misc/sort-debug-keys
index 57a52a6..4e8beff 100755
--- a/tests/misc/sort-debug-keys
+++ b/tests/misc/sort-debug-keys
@@ -275,7 +275,7 @@ printf "2.,,3\n2.4\n" | sort -s -k1n --debug
 printf "2,,3\n2.4\n" | sort -s -k1n --debug

 # -z means we convert \0 to \n
-printf "1a\x002b\x00" | sort -s -n -z --debug
+printf "1a\0002b\000" | sort -s -n -z --debug

 # Check that \0 and \t intermix.
 printf "\0\ta\n" | sort -s -k2b,2 --debug | tr -d '\0'