[PATCH] libdw: Make __libdw_dieabbrev more robust on failure.

[Mark Wielaard]

On Thu, 2018-06-14 at 00:42 +0200, Mark Wielaard wrote:
> Make sure to always set die->abbrev to DWARF_END_ABBREV on failure.
> DWARF_END_ABBREV is also what the function reports on failure. And it
> will prevent trying to lookup the abbrev ever again.

Pushed to master.