migration: Skip only empty block devices

migration: Skip only empty block devices

The block .save_setup() handler calls a helper routine
init_blk_migration() which builds a list of block devices to take into
account for migration. When one device is found to be empty (sectors
== 0), the loop exits and all the remaining devices are ignored. This
is a regression introduced when bdrv_iterate() was removed.

Change that by skipping only empty devices.

Cc: Markus Armbruster <armbru@redhat.com>
Cc: qemu-stable <qemu-stable@nongnu.org>
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Fixes: fea68bb6e9fa ("block: Eliminate bdrv_iterate(), use bdrv_next()")
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Link: https://lore.kernel.org/r/20240312120431.550054-1-clg@redhat.com
[peterx: fix "Suggested-by:"]
Signed-off-by: Peter Xu <peterx@redhat.com>