IMP(shellcheck): quote variables (SC2086)

bin/hardening/5.2.1_sshd_conf_perm_ownership.sh

@@ -50,7 +50,7 @@ apply() {
         ok "$FILE has correct ownership"
     else
         warn "fixing $FILE ownership to $USER:$GROUP"
-        chown $USER:$GROUP $FILE
+        chown "$USER":"$GROUP" "$FILE"
     fi
     has_file_correct_permissions "$FILE" "$PERMISSIONS"
     if [ "$FNRET" = 0 ]; then