drm/i915: Use an uncommon name for the local dev_priv in macros

Using dev_priv__ avoids sparse complaining about shadowed variables in
the *LP_RING() macros.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/i915_drv.h

@@ -1095,26 +1095,26 @@ extern int intel_trans_dp_port_sel (struct drm_crtc *crtc);
 #define I915_VERBOSE 0
 
 #define BEGIN_LP_RING(n)  do { \
-	drm_i915_private_t *dev_priv = dev->dev_private;                \
+	drm_i915_private_t *dev_priv__ = dev->dev_private;                \
 	if (I915_VERBOSE)						\
 		DRM_DEBUG("   BEGIN_LP_RING %x\n", (int)(n));		\
-	intel_ring_begin(dev, &dev_priv->render_ring, (n));		\
+	intel_ring_begin(dev, &dev_priv__->render_ring, (n));		\
 } while (0)
 
 
 #define OUT_RING(x) do {						\
-	drm_i915_private_t *dev_priv = dev->dev_private;		\
+	drm_i915_private_t *dev_priv__ = dev->dev_private;		\
 	if (I915_VERBOSE)						\
 		DRM_DEBUG("   OUT_RING %x\n", (int)(x));		\
-	intel_ring_emit(dev, &dev_priv->render_ring, x);		\
+	intel_ring_emit(dev, &dev_priv__->render_ring, x);		\
 } while (0)
 
 #define ADVANCE_LP_RING() do {						\
-	drm_i915_private_t *dev_priv = dev->dev_private;                \
+	drm_i915_private_t *dev_priv__ = dev->dev_private;                \
 	if (I915_VERBOSE)						\
 		DRM_DEBUG("ADVANCE_LP_RING %x\n",			\
-				dev_priv->render_ring.tail);		\
-	intel_ring_advance(dev, &dev_priv->render_ring);		\
+				dev_priv__->render_ring.tail);		\
+	intel_ring_advance(dev, &dev_priv__->render_ring);		\
 } while(0)
 
 /**