bnxt_en: Remove superfluous memset()

Fixes coccicheck warning:

./drivers/net/ethernet/broadcom/bnxt/bnxt.c:3730:19-37: WARNING:
dma_alloc_coherent use in stats -> hw_stats already zeroes out
memory,  so memset is not needed

dma_alloc_coherent use in status already zeroes out memory,
so memset is not needed

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Li Heng <liheng40@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -3732,8 +3732,6 @@ static int bnxt_alloc_stats_mem(struct bnxt *bp, struct bnxt_stats_mem *stats,
 	if (!stats->hw_stats)
 		return -ENOMEM;
 
-	memset(stats->hw_stats, 0, stats->len);
-
 	stats->sw_stats = kzalloc(stats->len, GFP_KERNEL);
 	if (!stats->sw_stats)
 		goto stats_mem_err;