Dereference the node iterator when dumping the PBQP graph structure in DOT format.
Dereference the node iterator when dumping the PBQP graph structure in DOT
format.

Thanks to Arnaud A. de Grandmaison for the patch!



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@195316 91177308-0d34-0410-b5e6-96231b3b80d8

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