MAINTAINERS tree branches [xen tip as an example]

["Luis R. Rodriguez" <mcgrof@do-not-panic.com>]

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As per linux-next Next/Trees [0], and a recent January MAINTAINERS patch [1]
from David one of the xen development kernel git trees to track is
xen/git.git [2], this tree however gives has undefined references when doing a
fresh clone [shown below], but as expected does work well when only cloning
the linux-next branch [also below]. While I'm sure this is fine for
folks who can do the guess work do we really want to live with trees like
these on MAINTAINERS ? The MAINTAINERS file doesn't let us specify branches
required, so perhaps it should -- if we want to live with these ? Curious, how
many other git are there with a similar situation ?

The xen project web site actually lists [3] Konrad's xen git tree [4] for
development as the primary development tree, that probably should be
updated now, and likely with instructions to clone only the linux-next
branch ?

[0] https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/Next/Trees#n176
[1] http://lists.xen.org/archives/html/xen-devel/2014-01/msg01504.html
[2] git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git
[3] http://wiki.xenproject.org/wiki/Xen_Repositories#Primary_Xen_Repository
[4] git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git

mcgrof@bubbles ~ $ git clone
git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git --reference linux/.git
Cloning into 'tip'...
remote: Counting objects: 2806, done.
remote: Compressing objects: 100% (334/334), done.
remote: Total 1797 (delta 1511), reused 1646 (delta 1462)
Receiving objects: 100% (1797/1797), 711.01 KiB | 640.00 KiB/s, done.
Resolving deltas: 100% (1511/1511), completed with 306 local objects.
Checking connectivity... done.
warning: remote HEAD refers to nonexistent ref, unable to checkout.

mcgrof@work ~ $ git clone
git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git -b linux-next --reference linux/.git
Cloning into 'tip'...
remote: Counting objects: 2806, done.
remote: Compressing objects: 100% (377/377), done.
remote: Total 1797 (delta 1545), reused 1607 (delta 1419)
Receiving objects: 100% (1797/1797), 485.23 KiB | 0 bytes/s, done.
Resolving deltas: 100% (1545/1545), completed with 327 local objects.
Checking connectivity... done.
Checking out files: 100% (44979/44979), done.

  Luis

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