net: chelsio: remove unused function calc_tx_descs

The inlined helper function calc_tx_descs is not used and is redundant.
Remove it.

Cleans up clang scan build warning:
drivers/net/ethernet/chelsio/cxgb4/sge.c:814:28: warning: unused
function 'calc_tx_descs' [-Wunused-function]
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/sge.c

@@ -803,20 +803,6 @@ static inline unsigned int calc_tx_flits(const struct sk_buff *skb,
 	return flits;
 }
 
-/**
- *	calc_tx_descs - calculate the number of Tx descriptors for a packet
- *	@skb: the packet
- *	@chip_ver: chip version
- *
- *	Returns the number of Tx descriptors needed for the given Ethernet
- *	packet, including the needed WR and CPL headers.
- */
-static inline unsigned int calc_tx_descs(const struct sk_buff *skb,
-					 unsigned int chip_ver)
-{
-	return flits_to_desc(calc_tx_flits(skb, chip_ver));
-}
-
 /**
  *	cxgb4_write_sgl - populate a scatter/gather list for a packet
  *	@skb: the packet