Description: mt76: mt7921: fix possible invalid register access
References:
Notes:
 carnil> Introduced in ffa1bf97425b ("mt76: mt7921: introduce PM support"). Vulnerable
 carnil> versions: 5.12-rc1.
Bugs:
upstream: released (5.13-rc1) [fe3fccde8870764ba3e60610774bd7bc9f8faeff]
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: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: N/A "Vulnerable code not present"
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"