ACPI: x86: s2idle: Add for_each_lpi_constraint() helper

We have one existing and one coming user of this macro.
Introduce a helper.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/x86/s2idle.c

@@ -94,6 +94,11 @@ static struct lpi_constraints *lpi_constraints_table;
 static int lpi_constraints_table_size;
 static int rev_id;
 
+#define for_each_lpi_constraint(entry)						\
+	for (int i = 0;								\
+	     entry = &lpi_constraints_table[i], i < lpi_constraints_table_size;	\
+	     i++)
+
 static void lpi_device_get_constraints_amd(void)
 {
 	union acpi_object *out_obj;
@@ -296,30 +301,29 @@ static void lpi_device_get_constraints(void)
 
 static void lpi_check_constraints(void)
 {
-	int i;
+	struct lpi_constraints *entry;
 
-	for (i = 0; i < lpi_constraints_table_size; ++i) {
-		acpi_handle handle = lpi_constraints_table[i].handle;
-		struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
+	for_each_lpi_constraint(entry) {
+		struct acpi_device *adev = acpi_fetch_acpi_dev(entry->handle);
 
 		if (!adev)
 			continue;
 
-		acpi_handle_debug(handle,
+		acpi_handle_debug(entry->handle,
 			"LPI: required min power state:%s current power state:%s\n",
-			acpi_power_state_string(lpi_constraints_table[i].min_dstate),
+			acpi_power_state_string(entry->min_dstate),
 			acpi_power_state_string(adev->power.state));
 
 		if (!adev->flags.power_manageable) {
-			acpi_handle_info(handle, "LPI: Device not power manageable\n");
-			lpi_constraints_table[i].handle = NULL;
+			acpi_handle_info(entry->handle, "LPI: Device not power manageable\n");
+			entry->handle = NULL;
 			continue;
 		}
 
-		if (adev->power.state < lpi_constraints_table[i].min_dstate)
-			acpi_handle_info(handle,
+		if (adev->power.state < entry->min_dstate)
+			acpi_handle_info(entry->handle,
 				"LPI: Constraint not met; min power state:%s current power state:%s\n",
-				acpi_power_state_string(lpi_constraints_table[i].min_dstate),
+				acpi_power_state_string(entry->min_dstate),
 				acpi_power_state_string(adev->power.state));
 	}
 }