Comment # 2 on bug 1087067 from Martin Li��ka

So no, it's different story, will be fixed in:

SVN revision: 259083
Author: matz
Fix -Wstringop-overflow regression

we shouldn't claim string overflows for character arrays at
end of structures; the code that tries to avoid these
accidentally passed the address of the accessed member to
array_at_struct_end_p(), but that one wants the component_ref
or array_ref itself.  Needs updating of one testcase that
incorrectly expected warning to occur in this situation.