ftmod_zt: Add ZT_EVENT_ABORT event handling and update ZT_EVENT_OVERRUN error message.

ZT_EVENT_ABORT and ZT_EVENT_OVERRUN are HDLC events.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

libs/freetdm/src/ftmod/ftmod_zt/ftmod_zt.c

@@ -1066,16 +1066,20 @@ static __inline__ ftdm_status_t zt_channel_process_event(ftdm_channel_t *fchan,
 		break;
 	case ZT_EVENT_BADFCS:
 		{
-			ftdm_log_chan_msg(fchan, FTDM_LOG_ERROR, "Bad frame checksum (ZT_EVENT_BADFCS)!\n");
-			/* What else could we do? */
-			*event_id = FTDM_OOB_NOOP;
+			ftdm_log_chan_msg(fchan, FTDM_LOG_ERROR, "Bad frame checksum (ZT_EVENT_BADFCS)\n");
+			*event_id = FTDM_OOB_NOOP;	/* What else could we do? */
 		}
 		break;
 	case ZT_EVENT_OVERRUN:
 		{
-			ftdm_log_chan_msg(fchan, FTDM_LOG_ERROR, "Driver overrun! (ZT_EVENT_OVERRUN)\n");
-			/* What else could we do? */
-			*event_id = FTDM_OOB_NOOP;
+			ftdm_log_chan_msg(fchan, FTDM_LOG_ERROR, "HDLC frame overrun (ZT_EVENT_OVERRUN)\n");
+			*event_id = FTDM_OOB_NOOP;	/* What else could we do? */
+		}
+		break;
+	case ZT_EVENT_ABORT:
+		{
+			ftdm_log_chan_msg(fchan, FTDM_LOG_ERROR, "HDLC abort frame received (ZT_EVENT_ABORT)\n");
+			*event_id = FTDM_OOB_NOOP;	/* What else could we do? */
 		}
 		break;
 	case ZT_EVENT_NONE: