[PATCH] use dynamical allocation in device.c:get_*_name ()

[Robert Millan]

Hello!

This patch fixes lib/device.c to use dynamic allocation for the
device names obtained in get_*_name () functions:

 - the name variable is returned by the functions instead of
   passing by reference, so that they can allocate it themselves.
 - the get_*_name functions use asprintf() to allocate the device
   name dynamicaly.
 - for NetBSD, it still uses static allocation since the "opendisk"
   call is unable (that i know of) to deal with dynamic buffers.

This fix is needed to work for kernels that have device names longer than
16 chars, and for GCS compliance (section 4.1).

-- 
Robert Millan

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