i2c: sun6i-p2wi: use proper return value in probe

Fixes:
>> drivers/i2c/busses/i2c-sun6i-p2wi.c:243:10: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/i2c-sun6i-p2wi.c b/drivers/i2c/busses/i2c-sun6i-p2wi.c
index f1d3e6f..5d2d678 100644
--- a/drivers/i2c/busses/i2c-sun6i-p2wi.c
+++ b/drivers/i2c/busses/i2c-sun6i-p2wi.c
@@ -240,7 +240,7 @@
 	snprintf(p2wi->adapter.name, sizeof(p2wi->adapter.name), pdev->name);
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(dev, "failed to retrieve irq: %d\n", ret);
+		dev_err(dev, "failed to retrieve irq: %d\n", irq);
 		return irq;
 	}