[net] Revert "net: core: maybe return -EEXIST in __dev_alloc_name"

[David Miller]

From: Michael Ellerman <mpe at ellerman.id.au>
Date: Mon, 08 Jan 2018 14:26:12 +1100

> I don't see it in rc7, will it get to Linus sometime before the
> release?

I will do what I can to make sure it does, it is in my GIT tree.