gdb/

gdb/
	Make addrs->SECTINDEX always defined.
	* symfile.c (relative_addr_info_to_section_offsets): Check for
	SECTINDEX -1, not for zero ADDR.
	(addrs_section_compar): Remove checking for invalid SECTINDEX.
	(addr_info_make_relative): Set SECTINDEX to -1 for unmatched entries.
	* symfile.h (struct section_addr_info) <sectindex>: Update the comment
	on its validity.