[clang] hurd: Fix build with -Werror,-Wswitch (PR #78520)

[Samuel Thibault via cfe-commits]

sthibaul wrote:

> Is there a reason you put this first?

No particular reason.

> Otherwise IMO it is slightly neater to put it last.

Done so.

https://github.com/llvm/llvm-project/pull/78520