Revert "media: vivid: shut up warnings due to a non-trivial logic"

0day kernel testing robot got the below dmesg and the first bad commit is

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 3354b54f

[  248.847809] BUG: unable to handle kernel paging request at ffffc90000393131

[  248.848015] Call Trace:
[  248.848015]  ? vivid_dev_release+0xc0/0xc0
[  248.848015]  ? acpi_dev_pm_attach+0x27/0xd0

This reverts commit 3354b54f.