Description: io_uring/rsrc: fix null-ptr-deref in io_file_bitmap_get()
References:
 https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=io_uring-6.3&id=761efd55a0227aca3a69deacdaa112fffd44fe37
Notes:
 carnil> Commit fixes 4278a0deb1f6 ("io_uring: defer alloc_hint update
 carnil> to io_file_bitmap_set()") in 5.19-rc1.
Bugs:
upstream: released (6.3-rc4) [02a4d923e4400a36d340ea12d8058f69ebf3a383]
6.1-upstream-stable: released (6.1.22) [7b100a45dc19ffd708f364ba66601efaca1ccf56]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.1.25-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"