Fix transport/rx unused-variable warnings

[PetervdPerk-NXP]

I'm compiling with werror thus the unused zbuf variable come up as an errror.
Since they aren't used I'm just calling _z_zbuf_view

[p-avital]

Hi,
Thanks for the fix :)
However, these line will conflict with the massive PR that's coming for the new protocol, so we won't merge it. I'm keeping the PR open as a reminder to fix that on the new-protocol branch, although I think I already did :)

[PetervdPerk-NXP]

@p-avital what would be the schedule for this ''new protocol" PR?

[p-avital]

@PetervdPerk-NXP most likely, we'll merge it into main near the start of September.

[p-avital]

Hi @PetervdPerk-NXP ,
Just notifying you that the large new-protocol PR has been merged. Like I said earlier, I'm fairly certain your issue is now fixed. If not, feel free to make a new PR :)