nodedev: Make use of the compile-time missing enum in switch error

nodedev: Make use of the compile-time missing enum in switch error

So udevGetDeviceDetails was one those functions using an enum in a
switch, but since it had a 'default' case, compiler didn't warn about an
unhandled enum. Moreover, the error about an unsupported device type
reported in the default case is unnecessary, since by the time we get
there, udevGetDeviceType (which was called before) already made sure
that any unrecognized device types had been handled properly.

Signed-off-by: Erik Skultety <eskultet@redhat.com>