net/hsr: fix a warning message

WARN_ON_ONCE() takes a condition, it doesn't take an error message. I
have converted this to WARN() instead.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/hsr/hsr_device.c

···
 	return;
 
 out:
-	WARN_ON_ONCE("HSR: Could not send supervision frame\n");
+	WARN_ONCE(1, "HSR: Could not send supervision frame\n");
 	kfree_skb(skb);
 }