Merge pull request #13874 from jketema/use-after-free

C++: Improve use-after-free example code

Author: jketema

cpp/ql/src/Critical/UseAfterFree.cpp

@@ -1,9 +1,10 @@
-int f() {
+void f() {
 	char* buf = new char[SIZE];
-	....
+	...
 	if (error) {
-		free(buf); //error handling has freed the buffer
+		delete buf; //error handling has freed the buffer
 	}
 	...
 	log_contents(buf); //but it is still used here for logging
+	...
 }