gpio: aggregator: Use compound literal from the header

Instead of doing it in place, convert GPIO_LOOKUP_IDX() and GPIO_HOG()
to be compund literals that's allow to use them as rvalue in assignments.

Due to above conversion, use compound literal from the header
in the gpio-aggregator.c.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/gpio/gpio-aggregator.c

@@ -72,8 +72,7 @@ static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
 	if (!lookups)
 		return -ENOMEM;
 
-	lookups->table[*n] =
-		(struct gpiod_lookup)GPIO_LOOKUP_IDX(key, hwnum, NULL, *n, 0);
+	lookups->table[*n] = GPIO_LOOKUP_IDX(key, hwnum, NULL, *n, 0);
 
 	(*n)++;
 	memset(&lookups->table[*n], 0, sizeof(lookups->table[*n]));

include/linux/gpio/machine.h

@@ -75,7 +75,7 @@ struct gpiod_hog {
  * gpiod_get_index()
  */
 #define GPIO_LOOKUP_IDX(_key, _chip_hwnum, _con_id, _idx, _flags)         \
-{                                                                         \
+(struct gpiod_lookup) {                                                   \
 	.key = _key,                                                      \
 	.chip_hwnum = _chip_hwnum,                                        \
 	.con_id = _con_id,                                                \
@@ -87,7 +87,7 @@ struct gpiod_hog {
  * Simple definition of a single GPIO hog in an array.
  */
 #define GPIO_HOG(_chip_label, _chip_hwnum, _line_name, _lflags, _dflags)  \
-{                                                                         \
+(struct gpiod_hog) {                                                      \
 	.chip_label = _chip_label,                                        \
 	.chip_hwnum = _chip_hwnum,                                        \
 	.line_name = _line_name,                                          \