btshell: Fix restarting advertising instances

Connection handle needs to be cleared on disconnect. Otherwise
with multiple advertising instances active incorrect instance
may be matched and attempted to restart (ie if connection handle
is reused).

Author: sjanc

apps/btshell/src/main.c

@@ -1166,8 +1166,8 @@ btshell_restart_adv(struct ble_gap_event *event)
 #if MYNEWT_VAL(BLE_EXT_ADV)
     for (i = 0; i < BLE_ADV_INSTANCES; ++i) {
         if (ext_adv_restart[i].restart &&
-            (ext_adv_restart[i].conn_handle ==
-             event->disconnect.conn.conn_handle)) {
+            (ext_adv_restart[i].conn_handle == event->disconnect.conn.conn_handle)) {
+            ext_adv_restart[i].conn_handle = BLE_HS_CONN_HANDLE_NONE;
             rc = ble_gap_ext_adv_start(i, 0, 0);
             break;
         }