CheckClass::virtualDestructorError and a variation of CheckNullPointer::nullPointerError would print inconclusive,warning messages altough no --enable=warning was given. Fix.

lib/checkclass.cpp

@@ -1647,14 +1647,16 @@ void CheckClass::virtualDestructor()
 
 void CheckClass::virtualDestructorError(const Token *tok, const std::string &Base, const std::string &Derived, bool inconclusive)
 {
-    if (inconclusive)
+    if (inconclusive) {
-        reportError(tok, Severity::warning, "virtualDestructor", "Class '" + Base + "' which has virtual members does not have a virtual destructor.", CWE404, true);
+        if (_settings->isEnabled("warning"))
-    else
+            reportError(tok, Severity::warning, "virtualDestructor", "Class '" + Base + "' which has virtual members does not have a virtual destructor.", CWE404, true);
+    } else {
         reportError(tok, Severity::error, "virtualDestructor", "Class '" + Base + "' which is inherited by class '" + Derived + "' does not have a virtual destructor.\n"
                     "Class '" + Base + "' which is inherited by class '" + Derived + "' does not have a virtual destructor. "
                     "If you destroy instances of the derived class by deleting a pointer that points to the base class, only "
                     "the destructor of the base class is executed. Thus, dynamic memory that is managed by the derived class "
                     "could leak. This can be avoided by adding a virtual destructor to the base class.", CWE404, false);
+    }
 }
 
 //---------------------------------------------------------------------------

lib/checknullpointer.cpp

@@ -487,6 +487,8 @@ void CheckNullPointer::nullPointerError(const Token *tok, const std::string &var
 
 void CheckNullPointer::nullPointerError(const Token *tok, const std::string &varname, const Token* nullCheck, bool inconclusive)
 {
+    if (! _settings->isEnabled("warning"))
+        return;
     std::list<const Token*> callstack;
     callstack.push_back(tok);
     callstack.push_back(nullCheck);

test/testclass.cpp

@@ -1893,6 +1893,7 @@ private:
         errout.str("");
 
         settings0.inconclusive = inconclusive;
+        settings0.addEnabled("warning");
 
         // Tokenize..
         Tokenizer tokenizer(&settings0, this);