[Bug c/66088] -Wunused-but-set-variable does not regard static variable access in local scope

[vshebordaev at mail dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66088

--- Comment #1 from Vladimir <vshebordaev at mail dot ru> ---
Well, the build is broken when -Werror option is specified just like it is
expected, I've overlooked a typo.