[Bug other/80066] dead stores and initializations pointed out by clang --analyze

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80066

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Created attachment 40983
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40983&action=edit
proposed patch