igb: Remove unnecessary usages of memset

Replace memsets of 1 byte with simple assignment.
Issue found with checkpatch.pl

Signed-off-by: Suraj Upadhyay <usuraj35@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/igb/igb_ethtool.c

@@ -1782,8 +1782,8 @@ static void igb_create_lbtest_frame(struct sk_buff *skb,
 	memset(skb->data, 0xFF, frame_size);
 	frame_size /= 2;
 	memset(&skb->data[frame_size], 0xAA, frame_size - 1);
-	memset(&skb->data[frame_size + 10], 0xBE, 1);
-	memset(&skb->data[frame_size + 12], 0xAF, 1);
+	skb->data[frame_size + 10] = 0xBE;
+	skb->data[frame_size + 12] = 0xAF;
 }
 
 static int igb_check_lbtest_frame(struct igb_rx_buffer *rx_buffer,