net: gemini: remove unnecessary assert

The driver does not advertize NETIF_F_FRAGLIST, the stack can't
pass skbs with frags lists to the xmit function.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cortina/gemini.c

@@ -1235,8 +1235,6 @@ static int gmac_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 	int txq_num, nfrags;
 	union dma_rwptr rw;
 
-	SKB_FRAG_ASSERT(skb);
-
 	if (skb->len >= 0x10000)
 		goto out_drop_free;