Fix possible NPE for UNKNOWN code path

Bug: 200595320
Test: Manual
Tag: #feature
Change-Id: I89b52553990bf58b8af304bab0bdd4cd8e8cb017
diff --git a/system/stack/smp/smp_act.cc b/system/stack/smp/smp_act.cc
index 9ec152c..1f6544a 100644
--- a/system/stack/smp/smp_act.cc
+++ b/system/stack/smp/smp_act.cc
@@ -1497,7 +1497,9 @@
           break;
         case SMP_OOB_UNKNOWN:
           LOG_WARN("SMP_MODEL_SEC_CONN_OOB with SMP_OOB_UNKNOWN");
-          smp_send_pair_fail(p_cb, NULL);
+          tSMP_INT_DATA smp_int_data;
+          smp_int_data.status = SMP_PAIR_AUTH_FAIL;
+          smp_send_pair_fail(p_cb, &smp_int_data);
           return;
       }
     }