[PATCH] libdwfl: Update docs and nonnull attributes for dwfl_module_addrinfo

[Mark Wielaard]

Hi,

On Sun, 2022-05-15 at 22:00 +0200, Mark Wielaard wrote:
> Make clear that both the offset and sym arguments cannot be NULL.
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1986555

I didn't get feedback on the actual wording, but I think this is better
than we had. So pushed.

Cheers,

Mark