staging: r8188eu: convert rtw_p2p_get_peer_devaddr_by_invitation to return void

rtw_p2p_get_peer_devaddr_by_invitation always returns 0 and it's return
value is not used. Convert it to return void.
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/06e2dce5de14c1abe457a40ec9ca597a06095437.1643466748.git.abdun.nihaal@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/os_dep/ioctl_linux.c

@@ -2547,12 +2547,12 @@ static void rtw_p2p_get_peer_devaddr(struct net_device *dev,
 	wrqu->data.length = strlen(extra);
 }
 
-static int rtw_p2p_get_peer_devaddr_by_invitation(struct net_device *dev,
-			       struct iw_request_info *info,
-			       union iwreq_data *wrqu, char *extra)
+static void rtw_p2p_get_peer_devaddr_by_invitation(struct net_device *dev,
+						   struct iw_request_info *info,
+						   union iwreq_data *wrqu,
+						   char *extra)
 
 {
-	int ret = 0;
 	struct adapter *padapter = (struct adapter *)rtw_netdev_priv(dev);
 	struct wifidirect_info *pwdinfo = &padapter->wdinfo;
 
@@ -2562,7 +2562,6 @@ static int rtw_p2p_get_peer_devaddr_by_invitation(struct net_device *dev,
 	sprintf(extra, "\nMAC %pM",
 		pwdinfo->p2p_peer_device_addr);
 	wrqu->data.length = strlen(extra);
-	return ret;
 }
 
 static int rtw_p2p_get_groupid(struct net_device *dev,