iommu: re-use local fwnode variable in iommu_ops_from_fwnode()

iommu_ops_from_fwnode() stores &iommu_spec->np->fwnode in local
variable, so use it to simplify the code (iommu_spec is not changed
between these dereferences).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240216144027.185959-4-krzysztof.kozlowski@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: krzk

drivers/iommu/of_iommu.c

@@ -29,7 +29,7 @@ static int of_iommu_xlate(struct device *dev,
 	    !of_device_is_available(iommu_spec->np))
 		return -ENODEV;
 
-	ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops);
+	ret = iommu_fwspec_init(dev, fwnode, ops);
 	if (ret)
 		return ret;
 	/*