Update cpp/ql/src/Likely Bugs/Arithmetic/IntMultToLong.cpp

Co-authored-by: Geoffrey White <40627776+geoffw0@users.noreply.github.com>

Author: vadi2

cpp/ql/src/Likely Bugs/Arithmetic/IntMultToLong.cpp

@@ -5,4 +5,4 @@ long j = i * i; //Wrong: due to overflow on the multiplication between ints,
 long k = (long) i * i; //Correct: the multiplication is done on longs instead of ints, 
                        //and will not overflow
 
-long k = static_cast<long>(i * i); //Correct: modern C++
+long l = static_cast<long>(i * i); //Correct: modern C++