Fix two unused variable warnings, and tidy up NET_FAILURE_RETRY.

Despite being the original author, every time I look at NET_FAILURE_RETRY
I think the uninitialized "int fd;" is a bug. So let's kill that. Potentially
we could offer even more complete exception detail messages now, but I've
left that as a possible TODO.

Change-Id: I3a175c659dd6bdeb111938e2547710bb4880cc02
1 file changed