Using a VFIODevice handle local variable to improve the code readability.

no functional change intended

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20220502094223.36384-3-yi.l.liu@intel.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>