selftests/futex: Give circular-list nodes static storage

The registered robust-list head has static storage but points at three
automatic lock nodes. GCC warns about storing the address of a local
variable in the static head when building the selftest with -Wall.

Give the nodes static storage as well. This keeps every object in the
circular list alive through child exit without changing the list topology.

Signed-off-by: Miles Krause <mileskrause5200@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Link: https://patch.msgid.link/20260711-futex-robust-list-static-nodes-v1-1-723754d75cf5@gmail.com

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