i2c: sh_mobile: fix uninitialized var when debug is enabled

Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-sh_mobile.c

@@ -550,6 +550,7 @@ static struct dma_chan *sh_mobile_i2c_request_dma_chan(struct device *dev,
 
 	chan = dma_request_slave_channel_reason(dev, chan_name);
 	if (IS_ERR(chan)) {
+		ret = PTR_ERR(chan);
 		dev_dbg(dev, "request_channel failed for %s (%d)\n", chan_name, ret);
 		return chan;
 	}