EAN: fix return type of decode()

04_EAN/src/app.c

@@ -36,7 +36,7 @@ static enc_t encode(plain_t v, sig_t A, sig_t B) {
  * decodes ANB-coded values.
  * No signature checking is performed! This has to be done beforehand
  **/
-static bool decode(enc_t vc, sig_t A, sig_t B) {
+static plain_t decode(enc_t vc, sig_t A, sig_t B) {
   return (vc -B)/A;
 }