Nested classes are not properly formatted under --style=linux

Given this defintion in foo.h:
```c++
class A
{
    class B {
    };
};
```
When I format this using
```bash
google-astyle --style=linux foo.h
```
Then the opening brace for the nested class "B" is incorrectly lined up in the first column:
```c++
class A
{
    class B
{
    };
};
```
I note that if I change "class B" to "struct B" then it lines up properly.