iwlwifi: use reset to set transport header

Since offset is zero, it's not necessary to use set function. Reset
function is straightforward, and will remove the unnecessary add
operation in set function.

Signed-off-by: Zhang Shengju <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/wireless/intel/iwlwifi/pcie/tx.c

···
 
 			memcpy(skb_put(csum_skb, tcp_hdrlen(skb)),
 			       tcph, tcp_hdrlen(skb));
-			skb_set_transport_header(csum_skb, 0);
+			skb_reset_transport_header(csum_skb);
 			csum_skb->csum_start =
 				(unsigned char *)tcp_hdr(csum_skb) -
 						 csum_skb->head;