Error check various calls so it doesn't segfault if you start without root privs

Yona-Appletree / LEDscape

Beagle Bone Black cape and firmware for driving a large number of WS281x LED strips.

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Closed DanielO closed 7 years ago

DanielO commented 7 years ago

This looks like upstream code but it seems silly to crash unnecessarily :)

DanielO commented 7 years ago

I also fixed the warnings and added a cscope target. I have done light testing and everything seems to work identically as before.