[PATCH] nss_files: Fix re-reading of long lines [BZ #18991]

[DJ Delorie]

Florian Weimer <fweimer@redhat.com> writes:
> I think I found a way to salvage this approach.  If parse_line fails
> with ERANGE, we need to seek back to the start of the line.  We can do
> this because we know the exact length of the line in bytes at this point.

LGTM