>
> This one:
>
>    In mouse-wheel-global-text-scale:
>    mwheel.el:450:6: Warning: ‘unwind-protect’ without unwind forms
>
> is because weʼre protecting against errors from 
> `global-text-scale-adjust', but unlike `text-scale-{in,de}crease', that 
> doesnʼt signal an error when you reach the scale limit.
>
> Juri, we can add an unwind form of `t', or switch it to 
> `condition-case', whichever you prefer (Iʼm assuming perhaps 
> pessimistically that `global-text-scale-adjust' might signal in future).
>

The byte-compiler warning is correct, this is a copy-paste error in 
e0488f89d1, the unwind-protect is unnecessary and can be removed.