extcon: arizona: Use devm_kcalloc() in arizona_extcon_get_micd_configs()

* A multiplication for the size determination of a memory allocation
indicated that an array data structure should be processed.
Thus use the corresponding function "devm_kcalloc".

* Replace the specification of a data structure by a pointer dereference
to make the corresponding size determination a bit safer according to
the Linux coding style convention.

Signed-off-by: Markus Elfring <[e-mail]>
Reviewed-by: Charles Keepax <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/extcon/extcon-arizona.c

···
 		goto out;
 
 	nconfs /= entries_per_config;
-
-	micd_configs = devm_kzalloc(dev,
-				    nconfs * sizeof(struct arizona_micd_range),
+	micd_configs = devm_kcalloc(dev, nconfs, sizeof(*micd_configs),
 				    GFP_KERNEL);
 	if (!micd_configs) {
 		ret = -ENOMEM;