Update 11.6 to reflect standard

Rule text specifies that the exclusion is on integer constants
with value 0 instead of null pointer constants

Author: lcartey

c/misra/src/rules/RULE-11-6/CastBetweenPointerToVoidAndArithmeticType.ql

@@ -22,5 +22,5 @@ where
   typeTo = cast.getUnderlyingType() and
   [typeFrom, typeTo] instanceof ArithmeticType and
   [typeFrom, typeTo] instanceof VoidPointerType and
-  not isNullPointerConstant(cast.getExpr())
+  not cast.getExpr() instanceof Zero
 select cast, "Cast performed between a pointer to void type and an arithmetic type."