selftests/filesystems: remove CLONE_NEWPIDNS from setup_userns() helper

This is effectively unused and doesn't really server any purpose after
having reviewed all of the tests that rely on it.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-22-2e6f823ebdc0@kernel.org
Tested-by: syzbot@syzkaller.appspotmail.com
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2025-10-29 13:20:35 +01:00
commit e2b6e5eadc
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