[Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91389

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I see dead code everywhere in the function, they must have some weirdo macro
for cases that wraps everything in case something { ... } break;
Many of those break; statements are dead code.