Return "sensors -j" to null

[Originalme]

Modified original sensors -j call to output all to /dev/null. This prevents temp errors when something cannot be read. i.e. when Wi-Fi is disabled, this will cause an error to log to journal that "temp1_input" cannot be read for device.

[TamtamHero]

Thanks !

[TamtamHero]

Oh god, I should have tried that before merging :facepalm: Of course it should be sensors -j 2> /dev/null otherwise there's nothing to parse

Fixed with https://github.com/TamtamHero/fw-fanctrl/commit/5721a13f03e6cbff1d5c7cfa0923b5d1863f44a9

[zquestz]

That would be why I commented. =)