[Bug 2089676] [NEW] Fix compile warnings

Public bug reported:

There are several compile warnings during kernel build that prevent us
from using -Werror.

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/2089676

Title:
Fix compile warnings

Status in linux package in Ubuntu:
New

Bug description:
There are several compile warnings during kernel build that prevent us
from using -Werror.

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