pinctrl: pinconf-generic: Use kmemdup instead of kmalloc + memcpy

This issue was reported by coccicheck using the semantic patch
at scripts/coccinelle/api/memdup.cocci
Signed-off-by: Benoit Taine <benoit.taine@lip6.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinconf-generic.c

@@ -228,13 +228,12 @@ int pinconf_generic_parse_dt_config(struct device_node *np,
 	 * Now limit the number of configs to the real number of
 	 * found properties.
 	 */
-	*configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL);
+	*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
 	if (!*configs) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	memcpy(*configs, cfg, ncfg * sizeof(unsigned long));
 	*nconfigs = ncfg;
 
 out: