USB: serial: iuu_phoenix: drop excessive sanity checks

The transfer buffers and URBs are allocated and initialised by USB
serial core during probe, and there's no need to check for NULL transfer
buffers in the bulk-in completion handlers.
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/iuu_phoenix.c

@@ -588,9 +588,8 @@ static void read_buf_callback(struct urb *urb)
 	}
 
 	dev_dbg(&port->dev, "%s - %i chars to write\n", __func__, urb->actual_length);
-	if (data == NULL)
-		dev_dbg(&port->dev, "%s - data is NULL !!!\n", __func__);
-	if (urb->actual_length && data) {
+
+	if (urb->actual_length) {
 		tty_insert_flip_string(&port->port, data, urb->actual_length);
 		tty_flip_buffer_push(&port->port);
 	}
@@ -655,10 +654,8 @@ static void iuu_uart_read_callback(struct urb *urb)
 		/* error stop all */
 		return;
 	}
-	if (data == NULL)
-		dev_dbg(&port->dev, "%s - data is NULL !!!\n", __func__);
 
-	if (urb->actual_length == 1  && data != NULL)
+	if (urb->actual_length == 1)
 		len = (int) data[0];
 
 	if (urb->actual_length > 1) {