[patch] Fix `abfd' -> `obfd' in objfile

[Yao Qi]

struct objfield doesn't have field `abfd', but macro obj_section_addr
and obj_section_endaddr is still using it.  The reason GCC doesn't emit
error for this is that macro bfd_get_section_vma discards the first
parameter ((s)->objfile->abfd).

  #define bfd_get_section_vma(bfd, ptr) ((ptr)->vma + 0)

It is obvious, so I'll check it in later today if no objections.

-- 
Yao (齐尧)
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