Fixed #2300 (false positive: possible nullpointer dereference)

lib/checknullpointer.cpp

@@ -497,8 +497,8 @@ void CheckNullPointer::nullPointerByCheckAndDeRef()
                     continue;
                 }
 
-                // abort function..
-                if (Token::simpleMatch(tok2, ") ; }") &&
+                // calling unknown function (abort/init)..
+                if (Token::simpleMatch(tok2, ") ;") &&
                     Token::Match(tok2->link()->tokAt(-2), "[;{}] %var% ("))
                 {
                     break;

test/testnullpointer.cpp

@@ -747,6 +747,16 @@ private:
               "    }\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        // ticket: #2300 - calling unknown function that may initialize the pointer
+        check("Fred *fred;\n"
+              "void a() {\n"
+              "    if (!fred) {\n"
+              "        initfred();\n"
+              "        fred->x = 0;\n"
+              "    }\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 };