Description: Revert "kobject: Remove redundant checks for whether ktype is NULL"
References:
Notes:
 carnil> Introduced in 1b28cb81dab7 ("kobject: Remove redundant checks for whether ktype
 carnil> is NULL"). Vulnerable versions: 6.6-rc1.
Bugs:
upstream: released (6.8-rc5) [3ca8fbabcceb8bfe44f7f50640092fd8f1de375c]
6.7-upstream-stable: released (6.7.6) [b746d52ce7bcac325a2fa264216ead85b7fbbfaa]
6.6-upstream-stable: released (6.6.18) [7f414d306320f837cc3df96cf52161cb8290fb1b]
6.1-upstream-stable: N/A "Vulnerable code not present"
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.7-1)
6.1-bookworm-security: N/A "Vulnerable code not present"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"