Remove todo assert (#3714)

test/testnullpointer.cpp

@@ -2099,10 +2099,7 @@ private:
               "    if (!y) {}\n"
               "  }\n"
               "}\n");
-        TODO_ASSERT_EQUALS(
-            "",
-            "[test.cpp:13] -> [test.cpp:9]: (warning) Either the condition '!y' is redundant or there is possible null pointer dereference: x->g().\n",
-            errout.str());
+        ASSERT_EQUALS("", errout.str());
     }
 
     void nullpointer65() {