typo

mikrotik/mt_system

@@ -80,7 +80,7 @@ function get_mem_free {
     done <<< "$data")
 }
 function get_disk_total {
-  disk_free=$(
+  disk_total=$(
     while read -r line; do
       echo $line | grep KiB | awk '/total-hdd-space:/ {
         gsub(/KiB/,"",$2)