Stop persistent-mode fuzzpuzz exiting prematurely

In the transition to fuzz_one() I'd lost a "continue".

fuzzpuzz.c

@@ -161,6 +161,7 @@ int main(int argc, char **argv)
         } else {
             fprintf(stderr, "%s\n", err);
             ret = 1;
+            continue;
         }
     }
     return ret;