radv/gfx10: Use correct count of max_offchip_buffers.

Reviewed-by: Dave Airlie <airlied@redhat.com>
diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index d756357..35bf010 100644
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -2368,9 +2368,12 @@
 	case GFX7:
 	case GFX8:
 	case GFX9:
-	default:
 		max_offchip_buffers = MIN2(max_offchip_buffers, 508);
 		break;
+	case GFX10:
+		break;
+	default:
+		break;
 	}
 
 	*max_offchip_buffers_p = max_offchip_buffers;