staging: r8188eu: use mgmt to set start sequence number

Use the mgmt structure in issue_action_BA to set the start sequence
number.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220524090029.242584-12-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme_ext.c

@@ -5438,8 +5438,8 @@ void issue_action_BA(struct adapter *padapter, unsigned char *raddr, unsigned ch
 
 			BA_starting_seqctrl = start_seq << 4;
 		}
-		le_tmp = cpu_to_le16(BA_starting_seqctrl);
-		pframe = rtw_set_fixed_ie(pframe, 2, (unsigned char *)&le_tmp, &pattrib->pktlen);
+		mgmt->u.action.u.addba_req.start_seq_num = cpu_to_le16(BA_starting_seqctrl);
+		pattrib->pktlen += 2;
 		break;
 	case WLAN_ACTION_ADDBA_RESP:
 		mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;