staging: rtl8192e: Remove HTIOTActIsDisableMCS15()

Remove HTIOTActIsDisableMCS15() as it always returns false which leads to
one evaluation that is always false. Remove dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/004b43b098f14f82e9614578ea9f04ca95b48b4c.1698295861.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Philipp Hortmann

drivers/staging/rtl8192e/rtl819x_HTProc.c

@@ -207,11 +207,6 @@ static void HTIOTPeerDetermine(struct rtllib_device *ieee)
 	netdev_dbg(ieee->dev, "IOTPEER: %x\n", ht_info->IOTPeer);
 }
 
-static bool HTIOTActIsDisableMCS15(struct rtllib_device *ieee)
-{
-	return false;
-}
-
 static bool HTIOTActIsDisableMCSTwoSpatialStream(struct rtllib_device *ieee)
 {
 	return false;
@@ -691,10 +686,6 @@ void HTResetSelfAndSavePeerSetting(struct rtllib_device *ieee,
 		HTIOTPeerDetermine(ieee);
 
 		ht_info->iot_action = 0;
-		bIOTAction = HTIOTActIsDisableMCS15(ieee);
-		if (bIOTAction)
-			ht_info->iot_action |= HT_IOT_ACT_DISABLE_MCS15;
-
 		bIOTAction = HTIOTActIsDisableMCSTwoSpatialStream(ieee);
 		if (bIOTAction)
 			ht_info->iot_action |= HT_IOT_ACT_DISABLE_ALL_2SS;