staging: rtl8192e: Remove unsupported mode IW_MODE_MESH

Tasklet irq_rx_tasklet is scheduled when hw is receiving frames. Function
_rtl92e_irq_rx_tasklet() is then called which calls then
_rtl92e_rx_normal(). In _rtl92e_rx_normal() all frames are processed by
rtllib_rx(). When ieee->iw_mode is IW_MODE_MESH the function returns
0. The calling function then calls: dev_kfree_skb_any() which clears
the skb. So the driver clears all packets received in this mode. Remove
dead code in mode IW_MODE_MESH.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/54230361abba9f33827eac9bf5074dd9f62d787b.1691908402.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtllib.h

@@ -89,10 +89,6 @@ static inline void *netdev_priv_rsl(struct net_device *dev)
 #define HIGH_QUEUE			     7
 #define BEACON_QUEUE			   8
 
-#ifndef IW_MODE_MESH
-#define IW_MODE_MESH			7
-#endif
-
 #define IE_CISCO_FLAG_POSITION		0x08
 #define SUPPORT_CKIP_MIC			0x08
 #define SUPPORT_CKIP_PK			0x10

drivers/staging/rtl8192e/rtllib_rx.c

@@ -1013,17 +1013,15 @@ static int rtllib_rx_data_filter(struct rtllib_device *ieee, u16 fc,
 		}
 	}
 
-	if (ieee->iw_mode != IW_MODE_MESH) {
-		/* packets from our adapter are dropped (echo) */
-		if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
-			return -1;
+	/* packets from our adapter are dropped (echo) */
+	if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
+		return -1;
 
-		/* {broad,multi}cast packets to our BSS go through */
-		if (is_multicast_ether_addr(dst)) {
-			if (memcmp(bssid, ieee->current_network.bssid,
-				   ETH_ALEN))
-				return -1;
-		}
+	/* {broad,multi}cast packets to our BSS go through */
+	if (is_multicast_ether_addr(dst)) {
+		if (memcmp(bssid, ieee->current_network.bssid,
+			   ETH_ALEN))
+			return -1;
 	}
 	return 0;
 }
@@ -1499,8 +1497,6 @@ int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
 	case IW_MODE_MONITOR:
 		ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
 		break;
-	case IW_MODE_MESH:
-		break;
 	default:
 		netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
 		break;