Revert "Stop persistent-mode fuzzpuzz exiting prematurely"

That was completely wrong: a "continue" at the end of the loop is
unnecessary.

This reverts commit b91f9824b6f73290051025317f3387c7212fa05f.

fuzzpuzz.c

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