libdw: Enable building with -Og.

libdw: Enable building with -Og.

When building with -Og gcc is unable to see that __libdw_dieabbrev ()
will initialize what the second argument points to when no error occurs
as called by dwarf_child and dwarf_getattrs. Causing an possibly
uninitialized error. Just initialize readp/die_addr to NULL, which is
the value we would return if an error occurs anyway.

https://sourceware.org/bugzilla/show_bug.cgi?id=23914

Signed-off-by: Mark Wielaard <mark@klomp.org>