regulator: tps6586x: fix build warning in debug build

When building the driver in debug mode, it generates
warning as

drivers/regulator/tps6586x-regulator.c: In function 'tps6586x_regulator_probe':
drivers/regulator/tps6586x-regulator.c:392:9: warning: 'id' is used uninitialized in this function [-Wuninitialized]

Fix this warning.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reported-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/regulator/tps6586x-regulator.c

@@ -389,7 +389,7 @@ static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
 	int id;
 	int err;
 
-	dev_dbg(&pdev->dev, "Probing regulator %d\n", id);
+	dev_dbg(&pdev->dev, "Probing regulator\n");
 
 	pdata = dev_get_platdata(pdev->dev.parent);
 	if ((!pdata) && (pdev->dev.parent->of_node))