tree 22c1ffdbbc424b87066dc56fd7e3be95453a6ed5
parent 93f5e28326694d7ded38d82709d9760c8905268b
author Patrick Williams <patrick@stwcx.xyz> 1699104452 -0500
committer Patrick Williams <patrick@stwcx.xyz> 1699104455 -0500

async: client: avoid ambiguous base-class error

When using multiple generated client classes with client_t, we
can end up with an ambiguous base-class error.  Change the way
the `client_context_friend` utility derives the context pointer
from the `Client` template type, to avoid the ambiguity.

Previous failure when inheriting both `state::BMC` and `state::Host`
into a single `client_t`:

```
error: 'sdbusplus::async::client::details::client_context_friend' is an ambiguous base of 'sdbusplus::async::client::client<true, true, false, sdbusplus::client::xyz::openbmc_project::state::BMC, sdbusplus::client::xyz::openbmc_project::state::Host>'
         return static_cast<T*>(this)->ctx;
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I047f00ca8df071eef13e8fdd71a56910cc7b3e26