vfio: Fix unbalanced vfio_df_close call in no-iommu mode

For devices with no-iommu enabled in IOMMUFD VFIO compat mode, the group open
path skips vfio_df_open(), leaving open_count at 0. This causes a warning in
vfio_assert_device_open(device) when vfio_df_close() is called during group
close.

The correct behavior is to skip only the IOMMUFD bind in the device open path
for no-iommu devices. Commit 6086efe73498 omitted vfio_df_open(), which was
too broad. This patch restores the previous behavior, ensuring
the vfio_df_open is called in the group open path.

Fixes: 6086efe73498 ("vfio-iommufd: Move noiommu compat validation out of vfio_iommufd_bind()")
Suggested-by: Alex Williamson <[email protected]>
Suggested-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Jacob Pan <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

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