When I implemented MD DYNAMIC parsing, I was originally passing a linker_file_t so that the MD code could relocate pointers.

However, it turns out this isn't even filled in until later, so it was always 0.

Just pass the load base (ef->address) directly, as that's really the only thing we were interested in in the first place.

Fixes a crash on RB800 where it was trying to write to an unmapped address when updating the GOT.