gpio-adnp: Use common error handling code in adnp_gpio_dbg_show()

Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-adnp.c

@@ -192,28 +192,20 @@ static void adnp_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 		mutex_lock(&adnp->i2c_lock);
 
 		err = adnp_read(adnp, GPIO_DDR(adnp) + i, &ddr);
-		if (err < 0) {
-			mutex_unlock(&adnp->i2c_lock);
-			return;
-		}
+		if (err < 0)
+			goto unlock;
 
 		err = adnp_read(adnp, GPIO_PLR(adnp) + i, &plr);
-		if (err < 0) {
-			mutex_unlock(&adnp->i2c_lock);
-			return;
-		}
+		if (err < 0)
+			goto unlock;
 
 		err = adnp_read(adnp, GPIO_IER(adnp) + i, &ier);
-		if (err < 0) {
-			mutex_unlock(&adnp->i2c_lock);
-			return;
-		}
+		if (err < 0)
+			goto unlock;
 
 		err = adnp_read(adnp, GPIO_ISR(adnp) + i, &isr);
-		if (err < 0) {
-			mutex_unlock(&adnp->i2c_lock);
-			return;
-		}
+		if (err < 0)
+			goto unlock;
 
 		mutex_unlock(&adnp->i2c_lock);
 
@@ -240,6 +232,11 @@ static void adnp_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 				   direction, level, interrupt, pending);
 		}
 	}
+
+	return;
+
+unlock:
+	mutex_unlock(&adnp->i2c_lock);
 }
 
 static int adnp_gpio_setup(struct adnp *adnp, unsigned int num_gpios)