vfio/helpers: Refactor vfio_region_mmap() error handling

Move error handling code to the end of the function so that it can more
easily be shared by new mmap failure conditions.  No functional change
intended.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
1 file changed