coredump: use prepare credential guard

Use the prepare credential guard for allocating a new set of
credentials.

Link: https://patch.msgid.link/20251103-work-creds-guards-prepare_creds-v1-9-b447b82f2c9b@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2025-11-03 15:57:35 +01:00
commit 8ed3473c5a
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