[PATCH] Cleanup of input.c

[Bernd Edlinger]

Hi,

this started, because I saw get_next_line returns -1 on error, instead
of false: PR 77699.

But when I was there I also saw that read_line_num is using memmove on
non-aliased src & dest, instead of memcpy.  But then I see that
also adding a NUL byte is superfluos, and all the copying as well....


So the result is a cleanup of input.c that avoids lots of copying
altogether, because it is no longer necessary to do so.


Bootstrapped and reg-tested on x86_64-pc-linux-gnu.
Is it OK for trunk?


Thanks
Bernd.
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