CVE-2026-98462: Bluetooth: hci_conn: fix CIS hold ownership on reuse

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hciconn: fix CIS hold ownership on reuse

Commit 69997d50ec57 ("Bluetooth: ISO: handle bound CIS cleanup via hciconn") made hcibindcis() and hciconnectcis() return a connection with one hold for the ISO layer. hcibindcis() currently takes that hold only after configuring a CIS, so its BTCONNECTED and matching BTBOUND paths return a bare lookup result. Its configuration failure path can likewise call hciconndrop() before taking a hold.

Take the hold before any state-dependent return or configuration error so every successful return follows the documented ownership contract and every error drop is balanced.

hciconnectcis() also assumes hciconnlink() always takes a new CIS hold before dropping the one returned by hcibindcis(). However, the helper returns an existing link without taking another hold. In that case, preserve the CIS hold for the caller and drop the redundant LE hold because the existing link already owns its parent hold. Returning early also avoids changing an existing CIS back to BTCONNECT.