Loop devices: partially revert

lib/functions/image/partitioning.sh

@@ -244,18 +244,17 @@ function prepare_partitions() {
 		display_alert "Partitioning with the following options" "$partition_script_output" "debug"
 		echo "${partition_script_output}" | run_host_command_logged sfdisk "${SDCARD}".raw || exit_with_error "Partitioning failed!"
 	fi
-	
+
 	declare -g LOOP
 	call_extension_method "post_create_partitions" <<- 'POST_CREATE_PARTITIONS'
 		*called after all partitions are created, but not yet formatted*
 	POST_CREATE_PARTITIONS
 
 	# stage: mount image
 	# lock access to loop devices
+	exec {FD}> /var/lock/armbian-debootstrap-losetup
+	flock -x $FD
 	if [[ -z $LOOP ]]; then
-		exec {FD}> /var/lock/armbian-debootstrap-losetup
-		flock -x $FD
-
 		LOOP=$(losetup -f)
 		[[ -z $LOOP ]] && exit_with_error "Unable to find free loop device" 
 		display_alert "Allocated loop device" "LOOP=${LOOP}"