cris: arch-v32: gpio: Use kzalloc instead of kmalloc/memset

Turn a kmalloc/memset into an equivalent kzalloc.
Doing so also move the zero'ing of the memory outside of a mutex.
Signed-off-by: Christophe Jaillet <christophe.jaillet@wanadoo.fr>
Signed-off-by: Jesper Nilsson <jespern@axis.com>

arch/cris/arch-v32/drivers/mach-fs/gpio.c

@@ -425,12 +425,11 @@ gpio_open(struct inode *inode, struct file *filp)
 	if (p > GPIO_MINOR_LAST)
 		return -EINVAL;
 
-	priv = kmalloc(sizeof(struct gpio_private), GFP_KERNEL);
+	priv = kzalloc(sizeof(struct gpio_private), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
 	mutex_lock(&gpio_mutex);
-	memset(priv, 0, sizeof(*priv));
 
 	priv->minor = p;