gpio: pca953x: propagate the errno from the chip_init functions

Initializing the chips may return with an error, but this error gets
dropped in probe(). Propagate this further to the driver core. Also,
simplify returning the error in one of the init functions.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

drivers/gpio/gpio-pca953x.c

@@ -595,9 +595,6 @@ static int __devinit device_pca953x_init(struct pca953x_chip *chip, int invert)
 
 	/* set platform specific polarity inversion */
 	ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
-	if (ret)
-		goto out;
-	return 0;
 out:
 	return ret;
 }
@@ -639,7 +636,7 @@ static int __devinit pca953x_probe(struct i2c_client *client,
 	struct pca953x_platform_data *pdata;
 	struct pca953x_chip *chip;
 	int irq_base=0, invert=0;
-	int ret = 0;
+	int ret;
 
 	chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
 	if (chip == NULL)
@@ -672,9 +669,11 @@ static int __devinit pca953x_probe(struct i2c_client *client,
 	pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
 
 	if (chip->chip_type == PCA953X_TYPE)
-		device_pca953x_init(chip, invert);
+		ret = device_pca953x_init(chip, invert);
 	else
-		device_pca957x_init(chip, invert);
+		ret = device_pca957x_init(chip, invert);
+	if (ret)
+		goto out_failed;
 
 	ret = pca953x_irq_setup(chip, id, irq_base);
 	if (ret)