Patch for adduser: Create a system user

[Ralf Friedl]

Tito wrote:
> maybe this could fix the problem you report:
> ...
> 		/* create new gid always = uid and re-check if the uid is free */
> 		while (getgrgid(p->pw_uid) && getpwuid(p->pw_uid))
> 			p->pw_uid++;
>   
I think this shoud use "or", not "and":

		while (getgrgid(p->pw_uid) || getpwuid(p->pw_uid))
			p->pw_uid++;

Personally, I don't use this feature, it was only an observation that it 
might be possible to create duplicate ids if this feature is used.

Regards
Ralf Friedl