Description: io_uring/filetable: fix file reference underflow
References:
 https://kernel.dance/#9d94c04c0db024922e886c9fd429659f22f48ea4
Notes:
 carnil> Commit fixes 61c1b44a21d7 ("io_uring: fix deadlock on iowq file
 carnil> slot alloc") in 5.19-rc1.
Bugs:
upstream: released (6.1-rc7) [9d94c04c0db024922e886c9fd429659f22f48ea4]
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: released (6.0.12-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"