fix non-exhaustiveness in scanf.ml, caused by the fixing of PR#7390
fix non-exhaustiveness in scanf.ml, caused by the fixing of PR#7390

gerdstolpmann/ocaml,msprotz/ocaml,yunxing/ocaml,yunxing/ocaml,msprotz/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,yunxing/ocaml,yunxing/ocaml,msprotz/ocaml,gerdstolpmann/ocaml