tevent_signal: Fix a valgrind error

[Jeremy Allison]

On Wed, Feb 15, 2012 at 05:59:04PM +0100, Volker Lendecke wrote:
> 
> - Log -----------------------------------------------------------------
> commit 9e25361203155c25d5deee4acd1fce638808cdbf
> Author: Volker Lendecke <vl at samba.org>
> Date:   Wed Feb 15 16:17:34 2012 +0100
> 
>     tevent_signal: Fix a valgrind error
>     
>     This fixes an uninitialized read introduced by my fix for the tevent_signal
>     destructors. From looking at the code you might believe that this kicks in only
>     when talloc failed. But with -O3 I do see it in normal operations.
>     
>     Sorry for that.

Great catch Volker !!! I would not have expected that, thanks
for checking.

Jeremy.