Fix swap files.

When a dynamic file is deleted, all scoped references to other dynamic files are invalidated.

Fixes #124

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

src/fido/otp.c

@@ -443,6 +443,8 @@ int cmd_otp() {
         }
         else {
             delete_file(ef1);
+            // When a dynamic file is deleted, existing referenes are invalidated
+            ef2 = file_new(EF_OTP_SLOT2);
         }
         if (ef1_data) {
             file_put_data(ef2, tmp, sizeof(tmp));