thunderbolt: Rename shadowed variables bit to interrupt_bit and auto_clear_bit

cppcheck reports
drivers/thunderbolt/nhi.c:74:7: style: Local variable 'bit' shadows outer variable [shadowVariable]
  int bit;
      ^
drivers/thunderbolt/nhi.c:66:6: note: Shadowed declaration
 int bit = ring_interrupt_index(ring) & 31;
     ^
drivers/thunderbolt/nhi.c:74:7: note: Shadow variable
  int bit;
      ^
For readablity rename the outer to interrupt_bit and the innner
to auto_clear_bit.

Fixes: 468c49f ("thunderbolt: Disable interrupt auto clear for ring")
Cc: stable@vger.kernel.org
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Author: Tom Rix

drivers/thunderbolt/nhi.c

@@ -63,15 +63,15 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active)
 {
 	int reg = REG_RING_INTERRUPT_BASE +
 		  ring_interrupt_index(ring) / 32 * 4;
-	int bit = ring_interrupt_index(ring) & 31;
-	int mask = 1 << bit;
+	int interrupt_bit = ring_interrupt_index(ring) & 31;
+	int mask = 1 << interrupt_bit;
 	u32 old, new;
 
 	if (ring->irq > 0) {
 		u32 step, shift, ivr, misc;
 		void __iomem *ivr_base;
+		int auto_clear_bit;
 		int index;
-		int bit;
 
 		if (ring->is_tx)
 			index = ring->hop;
@@ -91,11 +91,12 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active)
 		 */
 		misc = ioread32(ring->nhi->iobase + REG_DMA_MISC);
 		if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
-			bit = REG_DMA_MISC_INT_AUTO_CLEAR;
+			auto_clear_bit = REG_DMA_MISC_INT_AUTO_CLEAR;
 		else
-			bit = REG_DMA_MISC_DISABLE_AUTO_CLEAR;
-		if (!(misc & bit))
-			iowrite32(misc | bit, ring->nhi->iobase + REG_DMA_MISC);
+			auto_clear_bit = REG_DMA_MISC_DISABLE_AUTO_CLEAR;
+		if (!(misc & auto_clear_bit))
+			iowrite32(misc | auto_clear_bit,
+				  ring->nhi->iobase + REG_DMA_MISC);
 
 		ivr_base = ring->nhi->iobase + REG_INT_VEC_ALLOC_BASE;
 		step = index / REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS;
@@ -115,7 +116,7 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active)
 
 	dev_dbg(&ring->nhi->pdev->dev,
 		"%s interrupt at register %#x bit %d (%#x -> %#x)\n",
-		active ? "enabling" : "disabling", reg, bit, old, new);
+		active ? "enabling" : "disabling", reg, interrupt_bit, old, new);
 
 	if (new == old)
 		dev_WARN(&ring->nhi->pdev->dev,