greybus: operation: make incomplete-message errors more informative

Include the operation id as well as the received and expected size
(from header) when reporting incomplete messages.

This information is useful when debugging communication errors.

Also invert the size test to match the error message and increase
readability.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/operation.c

@@ -899,8 +899,10 @@ void gb_connection_recv(struct gb_connection *connection,
 
 	header = data;
 	msg_size = le16_to_cpu(header->size);
-	if (msg_size > size) {
-		dev_err(&connection->dev, "incomplete message\n");
+	if (size < msg_size) {
+		dev_err(&connection->dev,
+			"incomplete message received: 0x%04x (%zu < %zu)\n",
+			le16_to_cpu(header->operation_id), size, msg_size);
 		return;		/* XXX Should still complete operation */
 	}