namespace: convert open_tree() to FD_ADD()

Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-5-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2025-11-23 17:33:23 +01:00
commit 542a406543
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