drm/i915: print the correct amount of bytes allocated for the CFB

And also print the threshold. I was surprised to see a log message
claiming the CFB size was 32mb when there was less than 24mb available
for it.
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_fbc.c

@@ -634,8 +634,9 @@ static int intel_fbc_alloc_cfb(struct drm_i915_private *dev_priv, int size,
 
 	dev_priv->fbc.uncompressed_size = size;
 
-	DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
-		      size);
+	DRM_DEBUG_KMS("reserved %llu bytes of contiguous stolen space for FBC, threshold: %d\n",
+		      dev_priv->fbc.compressed_fb.size,
+		      dev_priv->fbc.threshold);
 
 	return 0;