bnxt_en: Use kzalloc for allocating only one thing

Use kzalloc rather than kcalloc(1,...)

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
@@

- kcalloc(1,
+ kzalloc(
          ...)
// </smpl>
Signed-off-by: NZheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -8603,7 +8603,7 @@ static int bnxt_init_msix(struct bnxt *bp)
 
 static int bnxt_init_inta(struct bnxt *bp)
 {
-	bp->irq_tbl = kcalloc(1, sizeof(struct bnxt_irq), GFP_KERNEL);
+	bp->irq_tbl = kzalloc(sizeof(struct bnxt_irq), GFP_KERNEL);
 	if (!bp->irq_tbl)
 		return -ENOMEM;