C++: Exclude error types from NonPortablePrintf.

Author: geoffw0

cpp/ql/src/Likely Bugs/Memory Management/Padding/NonPortablePrintf.ql

@@ -88,7 +88,8 @@ where
   not arg.isAffectedByMacro() and
   size32 = ilp32.paddedSize(actual) and
   size64 = lp64.paddedSize(actual) and
-  size64 != size32
+  size64 != size32 and
+  not actual instanceof ErroneousType
 select arg,
   "This argument should be of type '" + expected.getName() + "' but is of type '" + actual.getName()
     + "' (which changes size from " + size32 + " to " + size64 + " on 64-bit systems)."