heimdal - hdb/ext.c - fix a "shadows variable" warning

[Love Hörnquist Åstrand]

> Matthias,
> 
> Have you sent these to Love already?  Otherwise, they will be reverted
> when we next merge with Heimdal. 
> 
> (For warning fixes, it's best to just wait until I merge in the updated
> version, rather than doing local changes). 

Yes, Matthias send me the patch earlier today, I've yet to have a chance to integrate it.

Matthias, I appreciate your work, just keep in mind that we old people are not as fast to commit stuff to the tree as you are :)

Love