dmaengine: xilinx_dma: fix xilinx_dma_child_probe() return documentation

Modify xilinx_dma_child_probe() return documentation to be inline
with implementation i.e. can also return failure value on error.

Signed-off-by: Radhey Shyam Pandey <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: Radhey Shyam Pandey

drivers/dma/xilinx/xilinx_dma.c

@@ -2924,7 +2924,7 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
  * @xdev: Driver specific device structure
  * @node: Device node
  *
- * Return: 0 always.
+ * Return: '0' on success and failure value on error.
  */
 static int xilinx_dma_child_probe(struct xilinx_dma_device *xdev,
 				    struct device_node *node)