[PATCH] Add test for re-defining an identical label

[Stephen Warren]

On 06/12/2012 02:48 PM, Stephen Warren wrote:
> From: Stephen Warren <swarren at nvidia.com>
> 
> When merging one device tree over the top of a previous tree, it is
> possible to define a duplicate label that has the same name and points
> to the same property or node. This is currently allowed by the duplicate
> label checking code. However, alternative duplicate label checking
> algorithms might not allow this. Add an explicit test to ensure this
> capability is maintained.

David, Jon, does this look like a reasonable test to add?