[PATCH 0/1] MR1318: ntdll: Write ret_len with the right size in user_mode_callback_return on arm64

[Martin Storsjö]

This fixes a regression since
4069a8b384c15a90a7af66636ec5650eeb53b391.

This is the same fix as in !1308, but for arm64.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/1318