staging: rtl8723au: Remove another unused prototype

Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/include/recv_osdep.h

@@ -23,7 +23,6 @@ void _rtw_free_recv_priv23a (struct recv_priv *precvpriv);
 
 int rtw_recv_entry23a(struct recv_frame *precv_frame);
 int rtw_recv_indicatepkt23a(struct rtw_adapter *adapter, struct recv_frame *precv_frame);
-void rtw_recv_returnpacket(struct net_device *cnxt, struct sk_buff *preturnedpkt);
 
 void rtw_hostapd_mlme_rx23a(struct rtw_adapter *padapter, struct recv_frame *precv_frame);
 void rtw_handle_tkip_mic_err23a(struct rtw_adapter *padapter, u8 bgroup);