svga: skip assertion when index_bias < 0

See bug 688383

diff --git a/src/gallium/drivers/svga/svga_draw.c b/src/gallium/drivers/svga/svga_draw.c
index aa09669..1881dbd 100644 (file)
--- a/src/gallium/drivers/svga/svga_draw.c
+++ b/src/gallium/drivers/svga/svga_draw.c
@@ -280,7 +280,7 @@ enum pipe_error svga_hwtnl_prim( struct svga_hwtnl *hwtnl,
          if (index_bias >= 0) {
             assert(offset + index_bias*stride < size);
          }
-         if (min_index != ~0) {
+         if (min_index != ~0 && index_bias >= 0) {
             assert(offset + (index_bias + min_index) * stride < size);
          }