CID 1456199: Resource leak in test_hs_control_store_permanent_creds()

** CID 1456199:  Resource leaks  (RESOURCE_LEAK)
/src/test/test_hs_control.c: 534 in test_hs_control_store_permanent_creds()

________________________________________________________________________________________________________
*** CID 1456199:  Resource leaks  (RESOURCE_LEAK)
/src/test/test_hs_control.c: 534 in test_hs_control_store_permanent_creds()
528     
529         #ifdef _WIN32
530           ret = mkdir(perm_creds_dir);
531         #else
532           ret = mkdir(perm_creds_dir, 0700);
533         #endif
>>>     CID 1456199:  Resource leaks  (RESOURCE_LEAK)
>>>     Variable "perm_creds_dir" going out of scope leaks the storage it points to.
534         tt_int_op(ret, OP_EQ, 0);
535     
536         get_options_mutable()->ClientOnionAuthDir = perm_creds_dir;
537       }
538     
539       tor_free(args);