etl

180841fa - Put storage class first and remove unreachable statement (#505)

Put storage class first and remove unreachable statement (#505) Fixes following greenhills compiler warnings * etl/include/etl/message_router.h", line 2434 (col. 11): warning #111-D: statement is unreachable * etl/include/etl/char_traits.h", line 105 (col. 19): warning #82-D: storage class is not first Co-authored-by: Jochen Steinmann <jochen.steinmann2@de.bosch.com>