sis: Add assert to check function pointer is not null.

diff --git a/src/mesa/drivers/dri/sis/sis_tris.c b/src/mesa/drivers/dri/sis/sis_tris.c
index 4b41d78..e7471f9 100644 (file)
--- a/src/mesa/drivers/dri/sis/sis_tris.c
+++ b/src/mesa/drivers/dri/sis/sis_tris.c
@@ -994,6 +994,7 @@ sisFlushPrimsLocked(sisContextPtr smesa)
         MMIO(REG_3D_PrimitiveSet, smesa->dwPrimitiveSet);
       }
       while (smesa->vb_last < smesa->vb_cur) {
+        assert(sis_emit_func);
         sis_emit_func(smesa, (char *)smesa->vb_last);
         smesa->vb_last += incr;
       }