fix indexing

Author: paul-szczepanek-arm

connectivity/FEATURE_BLE/libraries/TARGET_CORDIO/source/PalGapImpl.cpp

@@ -326,13 +326,13 @@ ble_error_t PalGap::cancel_connection_creation(
     peer_address_type_t peerAddressType,
     const ble::address_t &peerAddress
 ) {
-    for (uint8_t connection_id = 1; connection_id <= DM_CONN_MAX; connection_id++) {
+    for (uint8_t connection_id = 0; connection_id < DM_CONN_MAX; connection_id++) {
         if (dmConnCb.ccb[connection_id].inUse &&
             dmConnCb.ccb[connection_id].state == DM_CONN_SM_ST_CONNECTING &&
             BdaCmp(dmConnCb.ccb[connection_id].peerAddr, peerAddress.data())) {
             DmConnClose(
                 DM_CLIENT_ID_APP,
-                /* connection handle */ connection_id,
+                /* connection handle */ connection_id + 1 /* connection IDs start at 1 */,
                 /* reason - invalid (use success) */ 0x00
             );
             return BLE_ERROR_NONE;