arm/smmu: address some violations of MISRA C Rule 20.7

MISRA C Rule 20.7 states: "Expressions resulting from the expansion
of macro parameters shall be enclosed in parentheses". Therefore, some
macro definitions should gain additional parentheses to ensure that all
current and future users will be safe with respect to expansions that
can possibly alter the semantics of the passed-in macro parameter.

No functional change.

Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/drivers/passthrough/arm/smmu.c

@@ -242,7 +242,7 @@ struct arm_smmu_xen_device {
 	struct iommu_group *group;
 };
 
-#define dev_archdata(dev) ((struct arm_smmu_xen_device *)dev->iommu)
+#define dev_archdata(dev) ((struct arm_smmu_xen_device *)(dev)->iommu)
 #define dev_iommu_domain(dev) (dev_archdata(dev)->domain)
 #define dev_iommu_group(dev) (dev_archdata(dev)->group)
 
@@ -627,7 +627,7 @@ struct arm_smmu_master_cfg {
 };
 #define INVALID_SMENDX			-1
 #define for_each_cfg_sme(cfg, i, idx, num) \
-	for (i = 0; idx = cfg->smendx[i], i < num; ++i)
+	for (i = 0; idx = (cfg)->smendx[i], (i) < (num); ++(i))
 
 struct arm_smmu_master {
 	struct device_node		*of_node;