* ieee.c: Lots of minor cleanups. Make many functions return

	* ieee.c: Lots of minor cleanups.  Make many functions return
	errors rather than calling abort.  Also:
	(ieee_write_twobyte): Remove; change callers to call existing
	ieee_write_2bytes function.
	(ieee_write_expression): Don't output the section twice when
	outputting a local symbol.  Don't emit an extraneous zero if there
	is only one term.
	(ieee_slurp_sections): Set the lma as well as the vma.
	(ieee_archive_p): Use bfd_alloc_grow rather than an obstack.