drm/i915: dev_priv cleanup in i915_gpu_error.c

And a little bit of cascaded function prototype changes.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2ebb8b8..92694e8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -17338,10 +17338,9 @@ intel_display_capture_error_state(struct drm_i915_private *dev_priv)
 
 void
 intel_display_print_error_state(struct drm_i915_error_state_buf *m,
-				struct drm_device *dev,
+				struct drm_i915_private *dev_priv,
 				struct intel_display_error_state *error)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
 	int i;
 
 	if (!error)
@@ -17361,13 +17360,13 @@ intel_display_print_error_state(struct drm_i915_error_state_buf *m,
 		err_printf(m, "Plane [%d]:\n", i);
 		err_printf(m, "  CNTR: %08x\n", error->plane[i].control);
 		err_printf(m, "  STRIDE: %08x\n", error->plane[i].stride);
-		if (INTEL_INFO(dev)->gen <= 3) {
+		if (INTEL_GEN(dev_priv) <= 3) {
 			err_printf(m, "  SIZE: %08x\n", error->plane[i].size);
 			err_printf(m, "  POS: %08x\n", error->plane[i].pos);
 		}
 		if (INTEL_GEN(dev_priv) <= 7 && !IS_HASWELL(dev_priv))
 			err_printf(m, "  ADDR: %08x\n", error->plane[i].addr);
-		if (INTEL_INFO(dev)->gen >= 4) {
+		if (INTEL_GEN(dev_priv) >= 4) {
 			err_printf(m, "  SURF: %08x\n", error->plane[i].surface);
 			err_printf(m, "  TILEOFF: %08x\n", error->plane[i].tile_offset);
 		}