The `PartitionTable.Clone()` method could end up dereferencing a `nil`
pointer in the `part` variable, if there would be a `nil` partition in
the partition table. Such situation would be an error of its own.
There is no point in checking if the cloned partition is not `nil` and
casting it to another variable. The logic should check if the cloned
partition is `nil` and panic in such situation. The following code can
then cast the clone to a different variable without issues and there is
no risk of dereferencing a `nil` pointer.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
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