FTBFS: fix Linux 5.9 build

Paolo Pisatirequested to merge
piso77/dm-writeboost:debian-fix-5.9-build into master

Fix Linux 5.9 build: remove uninitialized_var() usage

It's dangerous, can hide real bugs and suppress compiler warnings (see also 63a0895d960a "compiler: Remove uninitialized_var() macro" and 3f649ab728cd "treewide: Remove uninitialized_var() usage") and it has been retired upstream in 5.9.

Signed-off-by: Paolo Pisati paolo.pisati@canonical.com

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