Description: net: hso: fix null-ptr-deref during tty device unregistration
References:
Notes:
 carnil> Introduced in 72dc1c096c705 ("HSO: add option hso driver"). Vulnerable
 carnil> versions: 2.6.27-rc1.
Bugs:
upstream: released (5.12-rc7) [8a12f8836145ffe37e9c8733dce18c22fb668b66]
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 (5.10.30) [dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac]
4.19-upstream-stable: released (4.19.187) [92028d7a31e55d53e41cff679156b9432cffcb36]
sid: released (5.10.38-1)
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: released (4.19.194-1)