Can't use core::dbus::Signal::disconnect(SignatureToken) due to a compile error

[Jim Hodapp]

Tried to call core::dbus::Signal::disconnect(SignatureToken) but am running into the following compile error:

/usr/include/core/dbus/impl/signal.h:68:32: error: return-statement with a value, in function returning 'void' [-fpermissive]
    return handlers.erase(token);

Example code:

auto = end_of_stream_token = dbus.end_of_stream->connect([this]() {});
dbus.end_of_stream->disconnect(signals.end_of_stream_token);