net: qualcomm: rmnet: Remove invalid condition while stamping mux id

rmnet devices cannot have a mux id of 255. This is validated when
assigning the mux id to the rmnet devices. As a result, checking for
mux id 255 does not apply in egress path.
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c

@@ -143,10 +143,7 @@ static int rmnet_map_egress_handler(struct sk_buff *skb,
 	if (!map_header)
 		goto fail;
 
-	if (mux_id == 0xff)
-		map_header->mux_id = 0;
-	else
-		map_header->mux_id = mux_id;
+	map_header->mux_id = mux_id;
 
 	skb->protocol = htons(ETH_P_MAP);