xen-netback: use local var in xenvif_tx_check_gop() instead of re-calculating
shinfo already holds the result of skb_shinfo(skb) at this point - no need to re-invoke the construct even twice. Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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