e1000: Simple optimizations in e1000_xmit_frame

Some simple optimizations in e1000_xmit_frame.
Signed-off-by: NKrishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/e1000/e1000_main.c

@@ -3261,14 +3261,13 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 	unsigned int first, max_per_txd = E1000_MAX_DATA_PER_TXD;
 	unsigned int max_txd_pwr = E1000_MAX_TXD_PWR;
 	unsigned int tx_flags = 0;
-	unsigned int len = skb->len;
+	unsigned int len = skb->len - skb->data_len;
 	unsigned long flags;
-	unsigned int nr_frags = 0;
-	unsigned int mss = 0;
+	unsigned int nr_frags;
+	unsigned int mss;
 	int count = 0;
 	int tso;
 	unsigned int f;
-	len -= skb->data_len;
 
 	/* This goes back to the question of how to logically map a tx queue
 	 * to a flow.  Right now, performance is impacted slightly negatively
@@ -3302,7 +3301,7 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 		* points to just header, pull a few bytes of payload from
 		* frags into skb->data */
 		hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
-		if (skb->data_len && (hdr_len == (skb->len - skb->data_len))) {
+		if (skb->data_len && hdr_len == len) {
 			switch (adapter->hw.mac_type) {
 				unsigned int pull_size;
 			case e1000_82544: