let ed_patch_lines work with a c command that encompasses the last line

of the file. The TAILQ structures specifically contain an extra `first line'
to avoid this kind of issue, but no extra last line.
Instead of walking beyond the end of the structure, and wondering at the
null pointer, keep a pointer before the deleted block, as this one is
guaranteed to exist.

Fix Matthieu's testcase.

okay joris@, xsa@

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