e1000e: Remove unnecessary usages of memset

Replace memsets of 1 byte with simple assignments.
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/e1000e/ethtool.c

@@ -1608,8 +1608,8 @@ static void e1000_create_lbtest_frame(struct sk_buff *skb,
 	memset(skb->data, 0xFF, frame_size);
 	frame_size &= ~1;
 	memset(&skb->data[frame_size / 2], 0xAA, frame_size / 2 - 1);
-	memset(&skb->data[frame_size / 2 + 10], 0xBE, 1);
-	memset(&skb->data[frame_size / 2 + 12], 0xAF, 1);
+	skb->data[frame_size / 2 + 10] = 0xBE;
+	skb->data[frame_size / 2 + 12] = 0xAF;
 }
 
 static int e1000_check_lbtest_frame(struct sk_buff *skb,