Tags: patch

In a clone of https://github.com/abo-abo/swiper.git, with the following
remotes:

    $ git remote -v
    elpa	savannah:/srv/git/emacs/elpa.git (fetch)
    elpa	savannah:/srv/git/emacs/elpa.git (push)
    origin	git@github.com:basil-conto/swiper.git (fetch)
    origin	git@github.com:basil-conto/swiper.git (push)
    upstream	git@github.com:abo-abo/swiper.git (fetch)
    upstream	git@github.com:abo-abo/swiper.git (push)

0. emacs -Q ivy.el
1. M-: (vc-call-backend 'Git 'repository-url "upstream") RET

This returns: "git@github.com:basil-conto/swiper.git"
instead of:   "git@github.com:abo-abo/swiper.git"

Step 1 is effectively what bug-reference-try-setup-from-vc does, and I
believe the incorrect result is due to vc-git-repository-url expecting a
file name, not a Git remote name, as its first argument.

How's the attached fix?