[Bug c/71699] bogus -Wmaybe-uninitialized warning: gcc misses that non-NULL pointer + offset can never be NULL

[manish at mozilla dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71699

--- Comment #6 from Manish Goregaokar <manish at mozilla dot com> ---
I built gcc trunk, uncommenting `tail = name;` does not make the warning go
away unless I'm using -O2