Specifically, with clang-format --style='{ IndentWidth: 4, BreakBeforeBraces: Mozilla, ColumnLimit: 120, PointerAlignment: Middle }' which was the clang-format invocation that produced the fewest diffs on the nix source out of ~20 that I tried.
ipv4-fallback
fallback
LinkLocalAddressing
vswichtes
vswitches