media: cec-adap.c: log when claiming LA fails unexpectedly

If there is a hardware problem such as someone pulling the CEC line low
continuously, then the POLL message will fail with an error other than
OK, NACK, ABORTED or TIMEOUT. Log the tx_status value in that case to
help debug this.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/cec/core/cec-adap.c

@@ -1309,8 +1309,11 @@ static int cec_config_log_addr(struct cec_adapter *adap,
 	 * we assume that something is really weird and that it is not a
 	 * good idea to try and claim this logical address.
 	 */
-	if (i == max_retries)
+	if (i == max_retries) {
+		dprintk(0, "polling for LA %u failed with tx_status=0x%04x\n",
+			log_addr, msg.tx_status);
 		return 0;
+	}
 
 	/*
 	 * Message not acknowledged, so this logical