ksmbd: Reduce error log 'speed is unknown' to debug

This log happens on servers with a network bridge since
the bridge does not have a specified link speed.
This is not a real error so change the error log to debug instead.
Signed-off-by: NPer Forlin <perfn@axis.com>
Signed-off-by: NNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: NSteve French <stfrench@microsoft.com>

fs/ksmbd/smb2pdu.c

@@ -7111,8 +7111,8 @@ static int fsctl_query_iface_info_ioctl(struct ksmbd_conn *conn,
 			netdev->ethtool_ops->get_link_ksettings(netdev, &cmd);
 			speed = cmd.base.speed;
 		} else {
-			pr_err("%s %s\n", netdev->name,
-			       "speed is unknown, defaulting to 1Gb/sec");
+			ksmbd_debug(SMB, "%s %s\n", netdev->name,
+				    "speed is unknown, defaulting to 1Gb/sec");
 			speed = SPEED_1000;
 		}