If rdev can't be figured out, skip test
If rdev can't be figured out, skip test

I believe this happens when the root filesystem is on more than one
physical disk.

michaelkschmidt/fwup,michaelkschmidt/fwup,fhunleth/fwup,fhunleth/fwup,michaelkschmidt/fwup,fhunleth/fwup