staging: greybus: codecs: use dedicated list iterator variable

In preparation to limit the scope of the list iterator to the list
traversal loop, use a dedicated pointer to point to the found element [1].

Link: https://lore.kernel.org/all/[email protected]/
Reviewed-by: Dan Carpenter <[email protected]>
Reviewed-by: Vaibhav Agarwal <[email protected]>
Reviewed-by: Mark Greer <[email protected]>
Signed-off-by: Jakob Koschel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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