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Denis V. Lunev 319cd41f11 migration: add QEMU_COUNTED_STRING_SIZE for counted string buffers

A counted string carries its length in one byte, so the buffer that
qemu_get_counted_string() fills must hold 256 bytes. The dirty bitmap
load state spells that size as a bare 256 for both of its alias buffers.
Name it next to the qemu_get_counted_string() prototype and use it there,
in the length assert of qemu_put_counted_string() and in DBMLoadState.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Fabiano Rosas <farosas@suse.de>
Cc: Eric Blake <eblake@redhat.com>
Cc: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Cc: qemu-stable@nongnu.org
Message-ID: <20261006170738.453977-2-den@openvz.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>