Remove redundent Mark
Remove redundent Mark

ROUTINE_RVALUE(rot) is just the first element in
ROUTINE_FFI_ARG_STRUCTS(rot), which has been marked before

kealist/ren-c,draegtun/ren-c,codebybrett/ren-c,draegtun/ren-c,draegtun/ren-c,kealist/ren-c,giuliolunati/ren-c,kealist/ren-c,hostilefork/rebol,hostilefork/rebol,mbk/ren-c,draegtun/ren-c,kealist/ren-c,rgchris/ren-c,rgchris/ren-c,giuliolunati/ren-c,kealist/ren-c,hostilefork/rebol,hostilefork/rebol,codebybrett/ren-c,codebybrett/ren-c,mbk/ren-c,rgchris/ren-c,rgchris/ren-c,hostilefork/rebol,codebybrett/ren-c,codebybrett/ren-c,draegtun/ren-c,draegtun/ren-c,codebybrett/ren-c,giuliolunati/ren-c,hostilefork/rebol,kealist/ren-c,mbk/ren-c,mbk/ren-c,giuliolunati/ren-c,rgchris/ren-c,giuliolunati/ren-c