[tex-k] [web2c] Catch return value from fgets()

[Andreas Scherer]

Dear Norbert,

> react on the pull request.
They are just a reminder for myself, which issues I have reported with
patches in this list.

> If you want to use git, please first get a svn user/pass from Karl
I guess I will have to do this in the not so distant future, with the
current work of integrating CWEBbin in TeXLive.

> then see the bottom of 
> 	https://www.preining.info/blog/2018/06/git-and-subversion-collaboration/
Cool. I'll study your recipes.

Thanks,
Andreas