staging: r8188eu: convert rtw_p2p_invite_req to return void

rtw_p2p_invite_req 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/059a21d40a5c6cbe621ca969f9d32ea89bc9a977.1643466748.git.abdun.nihaal@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/os_dep/ioctl_linux.c

@@ -3037,11 +3037,10 @@ static int rtw_p2p_connect(struct net_device *dev,
 	return ret;
 }
 
-static int rtw_p2p_invite_req(struct net_device *dev,
-			      struct iw_request_info *info,
-			      union iwreq_data *wrqu, char *extra)
+static void rtw_p2p_invite_req(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;
 	int jj, kk;
@@ -3065,12 +3064,12 @@ static int rtw_p2p_invite_req(struct net_device *dev,
 
 	if (wrqu->data.length <=  37) {
 		DBG_88E("[%s] Wrong format!\n", __func__);
-		return ret;
+		return;
 	}
 
 	if (rtw_p2p_chk_state(pwdinfo, P2P_STATE_NONE)) {
 		DBG_88E("[%s] WiFi Direct is disable!\n", __func__);
-		return ret;
+		return;
 	} else {
 		/*	Reset the content of struct tx_invite_req_info */
 		pinvite_req_info->benable = false;
@@ -3143,7 +3142,6 @@ static int rtw_p2p_invite_req(struct net_device *dev,
 	} else {
 		DBG_88E("[%s] NOT Found in the Scanning Queue!\n", __func__);
 	}
-	return ret;
 }
 
 static int rtw_p2p_set_persistent(struct net_device *dev,