[AGPGART] Fix number of aperture sizes in 830 gart structs.

Spotted by Eric Anholt.
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/char/agp/intel-agp.c

@@ -1392,7 +1392,7 @@ static struct agp_bridge_driver intel_830_driver = {
 	.owner			= THIS_MODULE,
 	.aperture_sizes		= intel_i830_sizes,
 	.size_type		= FIXED_APER_SIZE,
-	.num_aperture_sizes	= 3,
+	.num_aperture_sizes	= 4,
 	.needs_scratch_page	= TRUE,
 	.configure		= intel_i830_configure,
 	.fetch_size		= intel_i830_fetch_size,
@@ -1554,7 +1554,7 @@ static struct agp_bridge_driver intel_915_driver = {
 	.owner			= THIS_MODULE,
 	.aperture_sizes		= intel_i830_sizes,
 	.size_type		= FIXED_APER_SIZE,
-	.num_aperture_sizes	= 3,
+	.num_aperture_sizes	= 4,
 	.needs_scratch_page	= TRUE,
 	.configure		= intel_i915_configure,
 	.fetch_size		= intel_i915_fetch_size,