vfio/pci: Remove an unnecessary blank line in vfio_pci_enable

This blank line is unnecessary, so remove it.

Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Message-Id: <1615808073-178604-1-git-send-email-wangzhou1@hisilicon.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>