ACPI: Remove unnecessary from/to-void* and to-void casts in drivers/acpi

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index 045c894..c413e69 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -99,8 +99,8 @@
 		     size_t count, loff_t * ppos)
 {
 	int result = 0;
-	struct seq_file *m = (struct seq_file *)file->private_data;
-	struct acpi_fan *fan = (struct acpi_fan *)m->private;
+	struct seq_file *m = file->private_data;
+	struct acpi_fan *fan = m->private;
 	char state_string[12] = { '\0' };
 
 
@@ -229,7 +229,7 @@
 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;
 
-	fan = (struct acpi_fan *)acpi_driver_data(device);
+	fan = acpi_driver_data(device);
 
 	acpi_fan_remove_fs(device);