miscellaneous dwarf.c tidies

	* dwarf.c: Leading and trailing whitespace fixes.
	(free_abbrev_list): New function.
	(free_all_abbrevs): Use the above.  Free cu_abbrev_map here too.
	(process_abbrev_set): Print actual section name on error.
	(get_type_abbrev_from_form): Add overflow check.
	(free_debug_memory): Don't free cu_abbrev_map here..
	(process_debug_info): ..or here.  Warn on another case of not
	finding a neeeded abbrev.