
Since fw update the logic of roam stats, the data of wmi_roam_trigger_reason maybe null when fw send event of WMI_ROAM_STATS_EVENTID to host driver, and at that time, the num_roam_trigger_reason is zero, we don't need reduce the length when extract roam stats event. Change-Id: I332de7ba2d2efeba722e2194af4b9c97ef310a73 CRs-Fixed: 3475501