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

@@ -598,11 +598,11 @@ bool ResolveExpression::visit(UnaryExpressionAST *ast)
                         }
                     }
                 }
+            }
             if (!added)
                 it.remove();
         }
     }
-    }
     return false;
 }