dmaengine: mmp_tdma: drop unnecessary OF node check in remove

The driver does not support anything but OF probe since commit
3b0f4a54f247 ("dma:mmp_tdma: get sram pool through device tree").

Commit a67ba97dfb30 ("dmaengine: Use device_get_match_data()") later
removed most remnants of platform probing except for an unnecessary OF
node check in remove().

Signed-off-by: Johan Hovold <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/mmp_tdma.c

···
 
 static void mmp_tdma_remove(struct platform_device *pdev)
 {
-	if (pdev->dev.of_node)
-		of_dma_controller_free(pdev->dev.of_node);
+	of_dma_controller_free(pdev->dev.of_node);
 }
 
 static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,