The parenthesis in __iommu_queue_command() are not needed when assigning 
into 'target' variable.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index de39e1f..69b4d06 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -65,7 +65,7 @@ static int __iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
  	u8 *target;

  	tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
-	target = (iommu->cmd_buf + tail);
+	target = iommu->cmd_buf + tail;
  	memcpy_toio(target, cmd, sizeof(*cmd));
  	tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
  	head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
--
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