xtensa: remove a sentinal

gas/ChangeLog:

2016-06-27  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* config/tc-xtensa.c (xtensa_elf_suffix): Use ARRAY_SIZE instead of a
	sentinal element.
	(map_suffix_reloc_to_operator): Likewise.
	(map_operator_to_reloc): Likewise.
2 files changed