ACPI / IPMI: change warning to debug on timeout

Getting timeout message from BMC when trying to read from a non-existent
FRU. This is expected but warning is not.

Let's reduce the warning to debug.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/acpi/acpi_ipmi.c

@@ -429,8 +429,7 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
 	if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE &&
 	    msg->msg.data_len == 1) {
 		if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) {
-			dev_WARN_ONCE(dev, true,
-				      "Unexpected response (timeout).\n");
+			dev_dbg_once(dev, "Unexpected response (timeout).\n");
 			tx_msg->msg_done = ACPI_IPMI_TIMEOUT;
 		}
 		goto out_comp;