run only when env is set

root/etc/s6-overlay/s6-rc.d/init-device-perms/run

@@ -1,7 +1,7 @@
 #!/usr/bin/with-contenv bash
 # shellcheck shell=bash
 
-if [[ -z ${LSIO_NON_ROOT_USER} ]]; then
+if [[ -z ${LSIO_NON_ROOT_USER} ]] && [[ -n ${ATTACHED_DEVICES_PERMS} ]]; then
     FILES=$(find ${ATTACHED_DEVICES_PERMS} -print 2>/dev/null)
 
     for i in ${FILES}; do