vfio: Create device specific region info helper
Given a device specific region type and sub-type, find it. Also cleanup return point on error in vfio_get_region_info() so that we always return 0 with a valid pointer or -errno and NULL. Signed-off-by: NAlex Williamson <alex.williamson@redhat.com> Reviewed-by: NGerd Hoffmann <kraxel@redhat.com> Tested-by: NGerd Hoffmann <kraxel@redhat.com>
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