Remove old style cast from qabstractxmlnodemodel.h

--- a/src/xmlpatterns/api/qabstractxmlnodemodel.h
+++ b/src/xmlpatterns/api/qabstractxmlnodemodel.h
@@ -95,7 +95,7 @@ namespace QPatternist
             /* Constructing to qptrdiff means we avoid the warning "cast to pointer
              * from integer of different size."
              */
-            return (void *)qptrdiff(data);
+            return reinterpret_cast<void *>(qptrdiff(data));
         }
 
         Data additionalData;

void myFunc(const Type1 &var) const
{
    Type2 &my_var = (Type2 &)var;
}