ipvlan: remove h from printk format specifier

This change fixes the checkpatch warning described in this commit
commit cbacb5ab0aa0 ("docs: printk-formats: Stop encouraging use of
unnecessary %h[xudi] and %hh[xudi]")

Standard integer promotion is already done and %hx and %hhx is useless
so do not encourage the use of %hh[xudi] or %h[xudi].

Cleanup output to use __func__ over explicit function strings.

Signed-off-by: Tom Rix <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ipvlan/ipvlan_core.c

···
 	}
 
 	/* Should not reach here */
-	WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
-			  port->mode);
+	WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
 out:
 	kfree_skb(skb);
 	return NET_XMIT_DROP;
···
 	}
 
 	/* Should not reach here */
-	WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
-			  port->mode);
+	WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
 	kfree_skb(skb);
 	return RX_HANDLER_CONSUMED;
 }