It is not always possible to determine the actual size of the VPD
data, so allow access to them if the size is set to '0'.
Tested-by: NShane Seymour <shane.seymour@hpe.com>
Tested-by: NBabu Moger <babu.moger@oracle.com>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Cc: Alexander Duyck <alexander.duyck@gmail.com>