bug#22907: `guix package -u` fails

[Nils Gillmann]

address@hidden ~$ time guix package --substitute-urls=hydra.gnu.org --dry-run 
-u *.*

real    0m1.779s
user    0m1.824s
sys     0m0.060s
address@hidden ~$ time guix package --substitute-urls=hydra.gnunet.org 
--dry-run -u *.*

real    0m1.763s
user    0m1.808s
sys     0m0.056s
address@hidden ~$ guix package --substitute-urls=hydra.gnunet.org --dry-run -u 
*.*
address@hidden ~$ guix package --substitute-urls=hydra.gnunet.org -u *.*
address@hidden ~$ 

so yes, it works but still nothing happens. Could be that there's
just no updates, but I should not have to provide *.* as it
worked before with just `guix package -u`

Although... does graffting after guix pull rebuild and update the
packages in the profile? current gen is after the update:

Generation 85   Mar 04 2016 12:30:38    (current)

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