chatllm: fix undefined behavior in resetContext #2041
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Chat::reset -> ChatLLM::resetContext is called when we change models. This will happen even if no model has been previously loaded.
In that case, m_llModelType is unset (contains a garbage value). regenerateResponse will attempt to read m_llModelType, causing undefined behavior (found by UBSAN) - but it seems like resetResponse was intended here anyway.