dmaengine: stm32-dma: Fix unsigned variable compared with zero

Commit f4fd2ec08f17: ("dmaengine: stm32-dma: use platform_get_irq()") used
unsigned variable irq to store the results and check later for negative
errors, so update the code to use signed variable for this

Fixes: f4fd2ec08f17 ("dmaengine: stm32-dma: use platform_get_irq()")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 33068185c0fe..dde796686736 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -1303,13 +1303,15 @@ static int stm32_dma_probe(struct platform_device *pdev)
         for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) {
                 chan = &dmadev->chan[i];
                 chan->irq = platform_get_irq(pdev, i);
-                if (chan->irq < 0)  {
-                        ret = chan->irq;
+                ret = platform_get_irq(pdev, i);
+                if (ret < 0)  {
                         if (ret != -EPROBE_DEFER)
                                 dev_err(&pdev->dev,
                                         "No irq resource for chan %d\n", i);
                         goto err_unregister;
                 }
+                chan->irq = ret;
+
                 ret = devm_request_irq(&pdev->dev, chan->irq,
                                        stm32_dma_chan_irq, 0,
                                        dev_name(chan2dev(chan)), chan);