bcache: Annotate switch fall-through

bcache: Annotate switch fall-through

BugLink: https://bugs.launchpad.net/bugs/1784665
This patch avoids that building with W=1 triggers complaints about
switch fall-throughs.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 9dfbdec7b7fea1ff1b7b5d5d12980dbc7dca46c7)
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>