gpio: virtuser: Use GPIO_LOOKUP_IDX() macro

Use GPIO_LOOKUP_IDX() macro which provides a compound literal
and can be used with dynamic data.

Signed-off-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-virtuser.c

···
 	size_t num_entries = gpio_virtuser_get_lookup_count(dev);
 	struct gpio_virtuser_lookup_entry *entry;
 	struct gpio_virtuser_lookup *lookup;
-	struct gpiod_lookup *curr;
 	unsigned int i = 0;
 
 	lockdep_assert_held(&dev->lock);
···
 
 	list_for_each_entry(lookup, &dev->lookup_list, siblings) {
 		list_for_each_entry(entry, &lookup->entry_list, siblings) {
-			curr = &table->table[i];
-
-			curr->con_id = lookup->con_id;
-			curr->idx = i;
-			curr->key = entry->key;
-			curr->chip_hwnum = entry->offset < 0 ?
-						U16_MAX : entry->offset;
-			curr->flags = entry->flags;
+			table->table[i] =
+				GPIO_LOOKUP_IDX(entry->key,
+						entry->offset < 0 ? U16_MAX : entry->offset,
+						lookup->con_id, i, entry->flags);
 			i++;
 		}
 	}