iommu/omap: Add check for iommu group when no IOMMU in use

Most of the devices in OMAP family of SoCs are not using IOMMU. The
patch for converting the OMAP IOMMU to use generic IOMMU bus probe
functionality failed to add a check for this, so add it here.

Fixes: c822b37 ("iommu/omap: Remove orphan_dev tracking")
Reported-by: Tomi Valkeinen <[email protected]>
Signed-off-by: Tero Kristo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: Tero Kristo via iommu

drivers/iommu/omap-iommu.c

@@ -1726,6 +1726,9 @@ static struct iommu_group *omap_iommu_device_group(struct device *dev)
 	struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
 	struct iommu_group *group = ERR_PTR(-EINVAL);
 
+	if (!arch_data)
+		return ERR_PTR(-ENODEV);
+
 	if (arch_data->iommu_dev)
 		group = iommu_group_ref_get(arch_data->iommu_dev->group);