fix bad typing in defmt debug

[ValouBambou]

This should fix #182.

[thejpster]

Thank you for the fix. Would you be able to amend CI so it actually builds with these logs enabled so this doesn't happen again?

[ValouBambou]

I can, but it seems that the defmt-log features is already present in the matrix in the ci yaml file, so I don't know why this error has not being caught before :/

[ValouBambou]

Ok I tried to investigate on why this error doesn't appear on the CI, but I cannot reproduce the issue anymore.
That's really weird because when writing this in a lib or a bin (like embassy rp blinky example) it doesn't compile:

let a = true;
defmt::info!("a = {=u8}", a);

Maybe it is a nightly issue (I updated the toolchains several times since I open the issue) but I'm not sure at all.

[thejpster]

Oh. Are you/we setting DEFMT_LOG?

[ValouBambou]

In my example yes with .cargo/config.toml but probably not in the CI you are right!