net: dsa: rtl8366: Skip PVID setting if not requested

[ Upstream commit 3dfe8dd ]

We go to lengths to determine whether the PVID should be set
for this port or not, and then fail to take it into account.
Fix this oversight.

Fixes: d865295 ("net: dsa: realtek-smi: Add Realtek SMI driver")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/dsa/rtl8366.c

@@ -436,6 +436,9 @@ void rtl8366_vlan_add(struct dsa_switch *ds, int port,
 				"failed to set up VLAN %04x",
 				vid);
 
+		if (!pvid)
+			continue;
+
 		ret = rtl8366_set_pvid(smi, port, vid);
 		if (ret)
 			dev_err(smi->dev,