The name is misleading (only the size is replicated, not the contents).
Further, they were only used by the corresponding DUP_ARR_*().

People, check your diffs and escape your dots!

This should make the system to find/use alloca more robust.

Silences clang -fsanitize=undefined.
Not sure why clang complains here.

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

It is hardly able to catch problems, because most arrays contain pointers.

Let list_for_each_entry(), list_for_each_entry_reverse() and list_for_each_entry_safe() declare their iterator variables.

It is identical to list_for_each(), though its comment claimed otherwise.