hf mf hardnested, now indicates if it failed when recovering key

client/src/cmdhfmfhard.c

@@ -2460,6 +2460,9 @@ int mfnestedhard(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBloc
         free_bitarray(all_bitflips_bitarray[EVEN_STATE]);
         free_sum_bitarrays();
         free_part_sum_bitarrays();
+
+        return (key_found) ? PM3_SUCCESS : PM3_EFAILED;
     }
+
     return PM3_SUCCESS;
 }