i965: Don't cast the result of brw_prepare_vertices to an unsigned value.

      Negative value means other errors, not aperture overflow. fix bug #15752

diff --git a/src/mesa/drivers/dri/i965/brw_draw.c b/src/mesa/drivers/dri/i965/brw_draw.c
index 6124ab6b0f0ee979a43837a05aa91b1e231bb344..5ccf4f4128b2059c984e8ea3955fa73bf88fd662 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_draw.c
+++ b/src/mesa/drivers/dri/i965/brw_draw.c
@@ -257,10 +257,12 @@ static GLboolean brw_try_draw_prims( GLcontext *ctx,
    struct intel_context *intel = intel_context(ctx);
    struct brw_context *brw = brw_context(ctx);
    GLboolean retval = GL_FALSE;
-   GLuint i, ret;
+   GLuint i;
    GLuint ib_offset;
    dri_bo *ib_bo;
    GLboolean force_flush = GL_FALSE;
+   int ret;
+
    if (ctx->NewState)
       _mesa_update_state( ctx );