Fix issue 9441: false positive: new(std::nothrow) and nullPointerRedundantCheck (cppcheck-opensource#2403)

* Fix issue 9441: false positive: new(std::nothrow) and nullPointerRedundantCheck

* Skip new if it is a variable

Author: pfultz2

lib/checknullpointer.cpp

@@ -322,6 +322,8 @@ static bool isNullablePointer(const Token* tok, const Settings* settings)
 {
     if (!tok)
         return false;
+    if (Token::simpleMatch(tok, "new") && tok->varId() == 0)
+        return false;
     if (astIsPointer(tok))
         return true;
     if (astIsSmartPointer(tok))

test/testnullpointer.cpp

@@ -85,7 +85,8 @@ class TestNullPointer : public TestFixture {
         TEST_CASE(nullpointer43); // #9404
         TEST_CASE(nullpointer44); // #9395, #9423
         TEST_CASE(nullpointer45);
-        TEST_CASE(nullpointer46); // #6850
+        TEST_CASE(nullpointer46); // #9441
+        TEST_CASE(nullpointer47); // #6850
         TEST_CASE(nullpointer_addressOf); // address of
         TEST_CASE(nullpointerSwitch); // #2626
         TEST_CASE(nullpointer_cast); // #4692
@@ -1615,6 +1616,14 @@ class TestNullPointer : public TestFixture {
     }
 
     void nullpointer46() {
+        check("void f() {\n"
+              "    char* p = new(std::nothrow) char[1];\n"
+              "    if( p ) {}\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
+    void nullpointer47() {
         check("void f(int *p) {\n"
               "   if(!p[0]) {}\n"
               "   const int *const a = p;\n"