igb: remove unused rx_hdr_split statistic

This statistic is not used and so it is safe to remove

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/igb.h

@@ -238,7 +238,6 @@ struct igb_adapter {
 
 	u64 hw_csum_err;
 	u64 hw_csum_good;
-	u64 rx_hdr_split;
 	u32 alloc_rx_buff_failed;
 	bool rx_csum;
 	u32 gorc;

drivers/net/igb/igb_ethtool.c

@@ -88,7 +88,6 @@ static const struct igb_stats igb_gstrings_stats[] = {
 	{ "rx_long_byte_count", IGB_STAT(stats.gorc) },
 	{ "rx_csum_offload_good", IGB_STAT(hw_csum_good) },
 	{ "rx_csum_offload_errors", IGB_STAT(hw_csum_err) },
-	{ "rx_header_split", IGB_STAT(rx_hdr_split) },
 	{ "alloc_rx_buff_failed", IGB_STAT(alloc_rx_buff_failed) },
 	{ "tx_smbus", IGB_STAT(stats.mgptc) },
 	{ "rx_smbus", IGB_STAT(stats.mgprc) },