9p: a couple of cleanup patches

[Dmitri Vorobiev]

Hello,

An error spotted by sparse inspired me for a quick code review
of the 9p driver, which resulted in a couple of nitpicking
patches that follow.

The patches were build-tested both for a modularized driver
and when the latter was included into the kernel proper.

Please consider.

Thanks,
Dmitri Vorobiev
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