[2.16 regression] "Infinite symlink recursion" when evaluating nixos-hardware

[K900]

With the latest nixos-hardware revision (NixOS/nixos-hardware@4cc688e):

❯ nix-shell -p nixVersions.nix_2_16 --run "nix eval --expr 'import ./common/pc/laptop/ssd' --impure"
error:
       … while calling the 'import' builtin

         at «string»:1:1:

            1| import ./common/pc/laptop/ssd
             | ^

       error: infinite symlink recursion in path '/home/k900/nixos-hardware/common/pc/laptop/ssd'

❯ nix-shell -p nixVersions.nix_2_15 --run "nix eval --expr 'import ./common/pc/laptop/ssd' --impure"
<LAMBDA>

[K900]

Bisected to 94812cc