support_short_GI
if (support_short_GI(padapter, &(pmlmeinfo->HT_caps), CHANNEL_WIDTH_20))
if (support_short_GI(padapter, &(pmlmeinfo->HT_caps), CHANNEL_WIDTH_40))
int support_short_GI(struct adapter *padapter, struct HT_caps_element *pHT_caps, u8 bwmode);