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v2: dplayx/tests: Test receiving ADDFORWARDREPLY.
dplayx: Handle ADDFORWARDREPLY and return error.
dplayx/tests: Test receiving REQUESTPLAYERREPLY with error result.
dplayx: Check reply result in DP_MSG_SendRequestPlayerId().
dplayx: Use the documented reply layout in DP_MSG_SendRequestPlayerId().
dplayx: Free message header on error path in DP_MSG_SendRequestPlayerId().
https://gitlab.winehq.org/wine/wine/-/merge_requests/6632