This patch replaces tt_assert() checks for NULL/non-NULL values with tt_ptr_op().
@@ -0,0 +1,11 @@
+@@
+expression * e;
+
+(
+- tt_assert(e != NULL)
++ tt_ptr_op(e, OP_NE, NULL)
+|
+- tt_assert(e == NULL)
++ tt_ptr_op(e, OP_EQ, NULL)
+)