[Bug c/58488] -Wuninitialized is useless for a variable whose address is later taken

[eblake at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58488

--- Comment #3 from Eric Blake <eblake at redhat dot com> ---
Since the engine is able to warn at -O0 when I _don't_ take the address, I
don't see why the warning is lost by the mere action of taking the address.