mgmt: updatehub: fix call to bin2hex

We noticed that in the master branch, updatehub fails to start.
That is because of the behaviour change in bin2hex caused by
commit f2affbd ("os: lib: bin2hex: fix memory overwrite").

Fixes: f2affbd ("os: lib: bin2hex: fix memory overwrite")
Signed-off-by: Yudong Zhang <mtwget@gmail.com>
2 files changed