ACPI: sysfs: Drop four redundant return statements

Signed-off-by: Clayton Casciato <majortomtosourcecontrol@gmail.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/sysfs.c

@@ -582,8 +582,6 @@ static void delete_gpe_attr_array(void)
 		kfree(counter_attrs);
 	}
 	kfree(all_attrs);
-
-	return;
 }
 
 static void gpe_count(u32 gpe_number)
@@ -598,8 +596,6 @@ static void gpe_count(u32 gpe_number)
 	else
 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 			     COUNT_ERROR].count++;
-
-	return;
 }
 
 static void fixed_event_count(u32 event_number)
@@ -612,8 +608,6 @@ static void fixed_event_count(u32 event_number)
 	else
 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 			     COUNT_ERROR].count++;
-
-	return;
 }
 
 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
@@ -914,8 +908,6 @@ static void __exit interrupt_stats_exit(void)
 	sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 
 	delete_gpe_attr_array();
-
-	return;
 }
 
 static ssize_t