usb: musb: core: Call dma_controller_destroy() in error path only once.

In commit f3ce4d5b ("usb: musb: core: call dma_controller_destroy() in the err path")
I erroneously assumed that the dma controller is not removed in the
error patch. This was wrong because it happens later via musb_free().
That means the original commit can be reverted because it is wrong or we
do this, so it is more obvious.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_core.c

@@ -1764,8 +1764,6 @@ static void musb_free(struct musb *musb)
 		free_irq(musb->nIrq, musb);
 	}
 	cancel_work_sync(&musb->irq_work);
-	if (musb->dma_controller)
-		dma_controller_destroy(musb->dma_controller);
 
 	musb_host_free(musb);
 }
@@ -1990,6 +1988,9 @@ static int musb_remove(struct platform_device *pdev)
 	musb_exit_debugfs(musb);
 	musb_shutdown(pdev);
 
+	if (musb->dma_controller)
+		dma_controller_destroy(musb->dma_controller);
+
 	musb_free(musb);
 	device_init_wakeup(dev, 0);
 	return 0;