Update testnullpointer.cpp

Author: chrchr-github

test/testnullpointer.cpp

@@ -202,7 +202,7 @@ class TestNullPointer : public TestFixture {
 #define checkP(...) checkP_(__FILE__, __LINE__, __VA_ARGS__)
     template<size_t size>
     void checkP_(const char* file, int line, const char (&code)[size]) {
-        const Settings settings1 = settingsBuilder(settings).certainty(Certainty::inconclusive, false).c(options.cstd).build();
+        const Settings settings1 = settingsBuilder(settings).certainty(Certainty::inconclusive, false).build();
 
         SimpleTokenizer2 tokenizer(settings1, *this, code, "test.cpp");