[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2245: fix current pyflakes warnings

[Tahoe-LAFS]

#2245: fix current pyflakes warnings
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 Reporter:  warner  |          Owner:
     Type:  defect  |         Status:  new
 Priority:  minor   |      Milestone:  1.11.0
Component:  code    |        Version:  1.10.0
 Keywords:          |  Launchpad Bug:
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 The current pyflakes (0.8.1) is more picky than earlier versions, and
 notices list comprehensions which shadow existing variables in their
 scope. This patch fixes those, by deleting the pre-existing variable
 (which is unused by that point). (it also fixes an unused-variable
 warning, which has probably been around for a while)

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2245>
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