dmaengine: xilinx: xilinx_dma: Fix kernel doc about xilinx_dma_remove()

Since commit cc99582 ("dmaengine: xilinx: xilinx_dma: Convert to
platform remove callback returning void") xilinx_dma_remove() doesn't
return zero any more. As the function has no return value any more, just
drop the statement about the return value.

Reported-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231014211656.1512016-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Uwe Kleine-König

drivers/dma/xilinx/xilinx_dma.c

@@ -3242,8 +3242,6 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 /**
  * xilinx_dma_remove - Driver remove function
  * @pdev: Pointer to the platform_device structure
- *
- * Return: Always '0'
  */
 static void xilinx_dma_remove(struct platform_device *pdev)
 {