net: hns3: Fix return of uninitialized variable ret

mainline inclusion
from mainline-master
commit 030c8198
category: feature
bugzilla: 173966
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=030c8198d744e4149da57bd2a73b87aa6a8aa272

----------------------------------------------------------------------

In the unlikely event that rule_cnt is zero the variable ret is
not assigned a value and function hclge_dbg_dump_fd_tcam can end
up returning an unitialized value in ret. Fix this by explicitly
setting ret to zero before the for-loop.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: b5a0b70d ("net: hns3: refactor dump fd tcam of debugfs")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Reviewed-by: NYongxin Li <liyongxin1@huawei.com>
Signed-off-by: NJunxin Chen <chenjunxin1@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c

@@ -1519,6 +1519,7 @@ static int hclge_dbg_dump_fd_tcam(struct hclge_dev *hdev, char *buf, int len)
 		goto out;
 	}
 
+	ret = 0;
 	for (i = 0; i < rule_cnt; i++) {
 		tcam_msg.stage = HCLGE_FD_STAGE_1;
 		tcam_msg.loc = rule_locs[i];