Fixed #2391 (cstdlib file and memory function check misbehavior)

lib/checkmemoryleak.cpp

@@ -3075,6 +3075,11 @@ void CheckMemoryLeakNoVar::check()
                             if (Token::Match(tok3->tokAt(-2), "[(,;{}] %var% ("))
                             {
                                 const std::string functionName = tok3->strAt(-1);
+                                if (functionName == "delete" ||
+                                    functionName == "free" ||
+                                    functionName == "fclose" ||
+                                    functionName == "realloc")
+                                    break;
                                 if (CheckMemoryLeakInFunction::test_white_list(functionName))
                                 {
                                     functionCallLeak(tok2, tok2->strAt(1), functionName);

test/testmemleak.cpp

@@ -4413,6 +4413,11 @@ private:
               "}\n");
         ASSERT_EQUALS("[test.cpp:2]: (error) Allocation with strdup, strcpy doesn't release it.\n", errout.str());
 
+        check("void x() {\n"
+              "    free(malloc(10));\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+
         // user function..
         check("void set_error(const char *msg) {\n"
               "}\n"