dma: imx-dma: fix signedness bug

mxdmac->channel was unsigned, so check (imxdmac->channel < 0) for
failed imx_dma_request_by_prio() made no sence.  Explicitly check
signed values.
Also, fix uninitialzed use of ret.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 346be6218058..f629e4961af5 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -335,8 +335,10 @@ static int __init imxdma_probe(struct platform_device *pdev)
 
                 imxdmac->imxdma_channel = imx_dma_request_by_prio("dmaengine",
                                 DMA_PRIO_MEDIUM);
-                if (imxdmac->channel < 0)
+                if ((int)imxdmac->channel < 0) {
+                        ret = -ENODEV;
                         goto err_init;
+                }
 
                 imx_dma_setup_handlers(imxdmac->imxdma_channel,
                        imxdma_irq_handler, imxdma_err_handler, imxdmac);