Re: [PATCH-next] fs/btrfs: Fix uninitialized variable

[David Sterba]

On Tue, Apr 13, 2021 at 02:06:04PM +0100, Khaled ROMDHANI wrote:
> The variable zone is not initialized. It
> may causes a failed assertion.

Failed assertion means the 2nd one checking that the result still fits
to 32bit type. That would mean that none of the cases were hit, but all
callers pass valid values.

It would be better to add a default: case to catch that explicitly,
though hitting that is considered 'will not happen'.