[PATCH] media: amphion: fix some issues reported by coverity

[Markus Elfring]

> CHECKED_RETURN: 4 case
> REVERSE_INULL: 2 case
> UNINIT: 6 case
> UNUSED_VALUE: 1 case

How does such a change combination fit to the development requirement
“Solve only one problem per patch.”?

See also:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.5-rc2#n81


Will further imperative change descriptions become more helpful?

Regards,
Markus