cxgb4i : Fix -Wmaybe-uninitialized warning.

Identified by kbuild test robot. csk family is always set to be AF_INET or
AF_INET6, so skb will always be initialized to some value but there is no harm
in silencing the warning anyways.

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Fixes : f42bb57 ('cxgb4i : Fix -Wunused-function warning')
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/scsi/cxgbi/cxgb4i/cxgb4i.c

@@ -758,7 +758,7 @@ static int act_open_rpl_status_to_errno(int status)
 
 static void csk_act_open_retry_timer(unsigned long data)
 {
-	struct sk_buff *skb;
+	struct sk_buff *skb = NULL;
 	struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 	void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,