igb: add counter for dma out of sync errors

Add a counter for dma out of sync errors reported via interrupt.

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>
diff --git a/drivers/net/igb/e1000_hw.h b/drivers/net/igb/e1000_hw.h
index acb42a2..62ccd49 100644
--- a/drivers/net/igb/e1000_hw.h
+++ b/drivers/net/igb/e1000_hw.h
@@ -359,6 +359,7 @@
 	u64 lenerrs;
 	u64 scvpc;
 	u64 hrmpc;
+	u64 doosync;
 };
 
 struct e1000_phy_stats {