FAILED: patch "[PATCH] net: dsa: fix spurious error message when unoffloaded port" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 43a4b4dbd48c9006ef64df3a12acf33bdfe11c61 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alvin=20=C5=A0ipraga?= <[email protected]>
Date: Tue, 12 Oct 2021 13:27:31 +0200
Subject: [PATCH] net: dsa: fix spurious error message when unoffloaded port
leaves bridge
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Flip the sign of a return value check, thereby suppressing the following spurious error:

port 2 failed to notify DSA_NOTIFIER_BRIDGE_LEAVE: -EOPNOTSUPP

... which is emitted when removing an unoffloaded DSA switch port from a bridge.

index 1c797ec8e2c2..6466d0539af9 100644
@@ -168,7 +168,7 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds,
 		if (extack._msg)
 			dev_err(ds->dev, "port %d: %s\n", info->port,
 				extack._msg);
-		if (err && err != EOPNOTSUPP)
+		if (err && err != -EOPNOTSUPP)
 			return err;
 	}