Description: tcp: Fix refcnt handling in __inet_hash_connect().
References:
Notes:
 carnil> Introduced in 66b60b0c8c4a ("dccp/tcp: Unhash sk from ehash for tb2 alloc
 carnil> failure after check_estalblished()."). Vulnerable versions: 6.1.80 6.6.19 6.7.7
 carnil> 6.8-rc6.
Bugs:
upstream: released (6.9-rc1) [04d9d1fc428ac9f581d55118d67e0cb546701feb]
6.8-upstream-stable: released (6.8.2) [ad105cde6b261b8b05ec872fe7d1987417d7fe5a]
6.7-upstream-stable: released (6.7.11) [1b20e61d36f490319d3fbdedd410155232ab5190]
6.6-upstream-stable: released (6.6.23) [856baaa100cd288d3685eedae9a129c996e7e755]
6.1-upstream-stable: released (6.1.83) [86d9b040421bbd26425f5a3edc226f57ecdecbfe]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.12-1)
6.1-bookworm-security: released (6.1.85-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"