Description: net: hso: fix NULL-deref on disconnect regression
References:
Notes:
 carnil> Introduced in 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device
 carnil> unregistration"). Vulnerable versions: 4.4.268 4.9.268 4.14.232 4.19.187
 carnil> 5.4.112 5.10.30 5.11.14 5.12-rc7.
Bugs:
upstream: released (5.13-rc1) [2ad5692db72874f02b9ad551d26345437ea4f7f3]
6.7-upstream-stable: N/A "Fixed before branching point"
6.6-upstream-stable: N/A "Fixed before branching point"
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: released (5.10.33) [90642ee9eb581a13569b1c0bd57e85d962215273]
4.19-upstream-stable: released (4.19.189) [5c17cfe155d21954b4c7e2a78fa771cebcd86725]
sid: N/A "No Debian released version vulnerable"
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: N/A "No Debian released version vulnerable"