xen-netback: Fix UAF when reading statistics data

The network statistic data in the driver is protected by RCU.
Unfortunately when tearing down the queues after an error during
connecting to the frontend (e.g. due to illegal Xenstore data filled
in by the guest), the statistic data is being freed without
synchronizing the RCU state.  In case the data is being read via sysfs
in this phase, access to already freed memory or memory being in new
use is possible.

Fix that by calling synchronize_net() before freeing the queue data.

This is XSA-526 / CVE-2026-100080

Reported-by: Yehyeong Lee <yhlee@isslab.korea.ac.kr>
Signed-off-by: Juergen Gross <jgross@suse.com>

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