[PATCH] dmaengine: loongson: loongson2-apb-cmc: Fix signedness bug in irq handling

Storing that negative value into an unsigned variable makes the check
`if (lchan->irq < 0)` always false, so probe errors are not correctly
detected and propagated.

Fix this by changing the type of `irq` to `int`, which allows proper
signed comparison and error handling.

Fixes: 1c0028e725f1 ("dmaengine: loongson: New driver for the Loongson Multi-Channel DMA controller")
Reported-by: Julia Lawall <[email protected]>
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Signed-off-by: Binbin Zhou <[email protected]>
---
 drivers/dma/loongson/loongson2-apb-cmc-dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/loongson/loongson2-apb-cmc-dma.c b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
index 1c9a542edc85..969dbc5dabe7 100644
--- a/drivers/dma/loongson/loongson2-apb-cmc-dma.c
+++ b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
@@ -90,7 +90,7 @@ struct loongson2_cmc_dma_chan {
 	struct dma_slave_config	dma_sconfig;
 	struct loongson2_cmc_dma_desc *desc;
 	u32 id;
-	u32 irq;
+	int irq;
 	u32 next_sg;
 	struct loongson2_cmc_dma_chan_reg chan_reg;
 };

base-commit: 075b74841bd0065a3bda3440873c747938e69b68
-- 
2.52.0