There is no need to have a duplication of the generic library, i.e. hex2bin().
Replace the open coded variant.
Signed-off-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: NMilan Broz <gmazyland@gmail.com>
Signed-off-by: NMike Snitzer <snitzer@redhat.com>