Get rid of redundant assignments to a variable slot from function
adfspart_check_ADFS. It is being assigned a value that is never read
as we are breaking out from the switch case and the function ends.

Reported by clang-tidy [deadcode.DeadStores]
Signed-off-by: Michal Orzel <michalorzel.eng@gmail.com>
Link: https://lore.kernel.org/r/20220423113811.13335-3-michalorzel.eng@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>