fix ykfde

utils/pkgs/ykfde/scripts/ykfde_enroll

@@ -28,6 +28,10 @@ while [ "$(ykinfo -q -"$YKFDE_SLOT")" != 1 ]
 do
 done
 
+rbtohex() {
+    ( od -An -vtx1 | tr -d ' \n' )
+}
+
 YKFDE_SALT="$(dd if=/dev/random bs=1 count=$YKFDE_SALT_LENGTH 2>/dev/null | rbtohex)"
 if [ -f "$YKFDE_STORAGE" ]; then
     YKFDE_SALT="$(head -1 $YKFDE_STORAGE)"