C++: fix invalid nesting of if statement.

Reported as a dead store by the clang static analyzer.

Change-Id: Id5eb72ea4698a17486b8a05d88ee66f3fd89bcfc
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/cplusplus/ResolveExpression.cpp

@@ -598,9 +598,9 @@ bool ResolveExpression::visit(UnaryExpressionAST *ast)
                         }
                     }
                 }
-                if (!added)
-                    it.remove();
             }
+            if (!added)
+                it.remove();
         }
     }
     return false;