fix build with kernel 5.6-rc1

[MilhouseVH]

Quick & dirty fix for 5.6-rc1. No problem if you'd rather fix this another way without the #ifdef.

Ref: torvalds/linux@d56c0d4

[GoTeamScotch]

Thanks for this. Does this kernel change affect how nuc_led is interacted with? Is it still through /proc/acpi/nuc_led? I'm not seeing anything in /proc/acpi besides 'wakeup'.

$ cat /proc/acpi/nuc_led
cat: /proc/acpi/nuc_led: No such file or directory
$ ls /proc/acpi
wakeup

On Ubuntu 18.04.3 (x64) on a NUC6CAY. This is after building and installing the .deb package (built using your patch to nuc_led.c).

[MilhouseVH]

Unfortunately I don't know - I'm patching this blind as I don't have any LED hardware on my Skylake NUC6i5SYH. I only see /proc/acpi/wakeup with kernels 5.5.11 and 5.6-rc7. I'll see if I can find someone with the appropriate LED hardware...

[zauguin]

@MilhouseVH On my NUC with kernel 5.6.7 this patch works great!
Especially the file /proc/acpi/nuc_led still appears and both reading and writing work fine.

[MilhouseVH]

Thanks. Never did find anyone to test this, so it's already been removed from LibreELEC.