Test for predictable device names

src/freedombone-utils-wifi

@@ -49,8 +49,11 @@ function default_network_config {
 # device names get assigned random names. This is a hacky workaround.
 # Also adding net.ifnames=0 to kernel options on bootloader may work.
 function enable_predictable_device_names {
+    test_predictable=$(ls -la /etc/udev/rules.d/80-net-setup-link.rules)
+    if [[ "$test_predictable" != *"/dev/null" ]]; then
         ln -s /dev/null /etc/udev/rules.d/80-net-setup-link.rules
         update-initramfs -u
+    fi
 }
 
 function wifi_is_running {