dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_advance_work()

It's easier to read code with fewer levels of indentation, remove a level
of indentation in at_xdmac_advance_work()

if (!foo() & !bar()) {
}

was replaced by:

if (foo() || bar())
	return;
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20211215110115.191749-9-tudor.ambarus@microchip.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/at_xdmac.c

@@ -1593,14 +1593,14 @@ static void at_xdmac_advance_work(struct at_xdmac_chan *atchan)
 	 * If channel is enabled, do nothing, advance_work will be triggered
 	 * after the interruption.
 	 */
-	if (!at_xdmac_chan_is_enabled(atchan) && !list_empty(&atchan->xfers_list)) {
-		desc = list_first_entry(&atchan->xfers_list,
-					struct at_xdmac_desc,
+	if (at_xdmac_chan_is_enabled(atchan) || list_empty(&atchan->xfers_list))
+		return;
+
+	desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc,
 				xfer_node);
 	dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
 	if (!desc->active_xfer)
 		at_xdmac_start_xfer(atchan, desc);
-	}
 }
 
 static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan)