iommu/arm-smmu-v3: Fix a couple of minor comment typos

Fix some comment typos spotted.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

drivers/iommu/arm-smmu-v3.c

@@ -708,7 +708,7 @@ static void queue_inc_prod(struct arm_smmu_queue *q)
 }
 
 /*
- * Wait for the SMMU to consume items. If drain is true, wait until the queue
+ * Wait for the SMMU to consume items. If sync is true, wait until the queue
  * is empty. Otherwise, wait until there is at least one free slot.
  */
 static int queue_poll_cons(struct arm_smmu_queue *q, bool sync, bool wfe)
@@ -2353,8 +2353,8 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu)
 	irq = smmu->combined_irq;
 	if (irq) {
 		/*
-		 * Cavium ThunderX2 implementation doesn't not support unique
-		 * irq lines. Use single irq line for all the SMMUv3 interrupts.
+		 * Cavium ThunderX2 implementation doesn't support unique irq
+		 * lines. Use a single irq line for all the SMMUv3 interrupts.
 		 */
 		ret = devm_request_threaded_irq(smmu->dev, irq,
 					arm_smmu_combined_irq_handler,