Fails to build with Clang < 16

Regressed by bd50e541. From error log:

$ export CC=clang15 CXX=clang++15
$ meson setup _build
$ meson compile -C _build
[...]
../src/device-state.c:162:11: error: label at end of compound statement: expected statement
  default:
          ^
           ;
../src/device-state.c:255:11: error: label at end of compound statement: expected statement
  default:
          ^
           ;