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/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
index 15fc124..6fbb420 100644
--- a/drivers/acpi/ibm_acpi.c
+++ b/drivers/acpi/ibm_acpi.c
@@ -1721,7 +1721,7 @@
 static int dispatch_read(char *page, char **start, off_t off, int count,
 			 int *eof, void *data)
 {
-	struct ibm_struct *ibm = (struct ibm_struct *)data;
+	struct ibm_struct *ibm = data;
 	int len;
 
 	if (!ibm || !ibm->read)
@@ -1746,7 +1746,7 @@
 static int dispatch_write(struct file *file, const char __user * userbuf,
 			  unsigned long count, void *data)
 {
-	struct ibm_struct *ibm = (struct ibm_struct *)data;
+	struct ibm_struct *ibm = data;
 	char *kernbuf;
 	int ret;
 
@@ -1775,7 +1775,7 @@
 
 static void dispatch_notify(acpi_handle handle, u32 event, void *data)
 {
-	struct ibm_struct *ibm = (struct ibm_struct *)data;
+	struct ibm_struct *ibm = data;
 
 	if (!ibm || !ibm->notify)
 		return;