staging: rtl8192e: Remove unused _rtl92e_wx_get_sens function

After removal of rf_set_sens variable, the _rtl92e_wx_get_sens function
always returns an error code.
This commit removes the unused function and the respective ioctl.
Suggested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Signed-off-by: Yogesh Hegde <yogi.kernel@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/eae80c4e2ac7f386c853cf824135b988c3666031.1682358035.git.yogi.kernel@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtl8192e/rtl_wx.c

@@ -803,15 +803,6 @@ static int _rtl92e_wx_get_retry(struct net_device *dev,
 	return 0;
 }
 
-static int _rtl92e_wx_get_sens(struct net_device *dev,
-			       struct iw_request_info *info,
-			       union iwreq_data *wrqu, char *extra)
-{
-	struct r8192_priv *priv = rtllib_priv(dev);
-
-	return -1;
-}
-
 static int _rtl92e_wx_set_sens(struct net_device *dev,
 			       struct iw_request_info *info,
 			       union iwreq_data *wrqu, char *extra)
@@ -1052,7 +1043,6 @@ static iw_handler r8192_wx_handlers[] = {
 	[IW_IOCTL(SIOCSIWMODE)] = _rtl92e_wx_set_mode,
 	[IW_IOCTL(SIOCGIWMODE)] = _rtl92e_wx_get_mode,
 	[IW_IOCTL(SIOCSIWSENS)] = _rtl92e_wx_set_sens,
-	[IW_IOCTL(SIOCGIWSENS)] = _rtl92e_wx_get_sens,
 	[IW_IOCTL(SIOCGIWRANGE)] = _rtl92e_wx_get_range,
 	[IW_IOCTL(SIOCSIWAP)] = _rtl92e_wx_set_wap,
 	[IW_IOCTL(SIOCGIWAP)] = _rtl92e_wx_get_wap,