gpiolib: cosmetic improvements for error handling in gpiochip_add()

Hopefully it makes the code look nicer and makes it easier to extend
this function.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
CC: devicetree-discuss@lists.ozlabs.org
CC: linux-kernel@vger.kernel.org

drivers/gpio/gpiolib.c

@@ -1101,11 +1101,17 @@ int gpiochip_add(struct gpio_chip *chip)
 
 unlock:
 	spin_unlock_irqrestore(&gpio_lock, flags);
-	if (status == 0)
+
+	if (status)
+		goto fail;
+
 	status = gpiochip_export(chip);
+	if (status)
+		goto fail;
+
+	return 0;
 fail:
 	/* failures here can mean systems won't boot... */
-	if (status)
 	pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n",
 		chip->base, chip->base + chip->ngpio - 1,
 		chip->label ? : "generic");