qcacld-3.0: Add comment between cases in switch statement

Add /* fallthrough */ comment in sme_qos_add_ts_failure_fnp
as per linux checkpatch script in case of reason
SME_QOS_REASON_REQ_SUCCESS of flow request.

Change-Id: I6ea942e53cd6f0828dbe55cfdd77ecf75cf1cdbb
CRs-Fixed: 2233176

core/sme/src/qos/sme_qos.c

@@ -7017,6 +7017,7 @@ static QDF_STATUS sme_qos_add_ts_failure_fnp(tpAniSirGlobal pMac, tListElem
 	case SME_QOS_REASON_MODIFY:
 		flow_info->reason = SME_QOS_REASON_REQ_SUCCESS;
 	case SME_QOS_REASON_REQ_SUCCESS:
+	/* fallthrough */
 	default:
 		inform_hdd = false;
 		break;