Daan De Meyer
4985c70162
Add a synchronous counterpart to qmp_client_invoke() that pumps the client's own process()/wait() loop until the reply for the issued command id arrives, mirroring sd_varlink_call()'s contract: *ret_result and *ret_error_desc are borrowed pointers into c->current, valid until the next qmp_client_call(), and a QMP error surfaces as -EIO when the caller doesn't ask for the description. Factor the command-build + slot-insert + enqueue sequence shared with qmp_client_invoke() into qmp_client_send(). A NULL callback marks the slot as synchronous: dispatch_reply still matches on id (so unknown ids continue to be logged and discarded, preserving async-only robustness), but skips the TAKE_PTR + callback invocation and leaves c->current pinned for qmp_client_call() to read out. Cover the three paths in test-qmp-client: successful reply, QMP error with ret_error_desc, and QMP error returned as -EIO.
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