* coffgen.c (make_a_section_from_file): Check return value of

	* coffgen.c (make_a_section_from_file): Check return value of
	_bfd_coff_read_string_table.
	(coff_real_object_p): Check return value of
	make_a_section_from_file.
	(_bfd_coff_read_string_table): Check that there are some symbols
	before trying to read the string table size.