[PATCH] Fix PR libstdc++/19510: Uninitialized variable in some iterators

[Paolo Carlini]

Volker Reichelt wrote:

>Bootstrapped and regtested on i686-pc-linux-gnu.
>OK to apply to mainline?
>  
>
Yes, it's ok, as agreed with Gaby on the audit trail.

>Btw, the initialization is missing in 3.4, too. But the warning is not
>triggered. Should the patch be applied there, too?
>  
>
Hummm, I don't feel strongly, but maybe we can avoid fiddling with
this old-good code on 3_4-branch, since the warning will never show-up.

Thanks!
Paolo.