drivers/s390: Remove unnecessary casts of private_data

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 04e532e..19a14d9 100644
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -47,7 +47,7 @@
 {
 	struct vmcp_session *session;
 
-	session = (struct vmcp_session *)file->private_data;
+	session = file->private_data;
 	file->private_data = NULL;
 	free_pages((unsigned long)session->response, get_order(session->bufsize));
 	kfree(session);
@@ -94,7 +94,7 @@
 		return -EFAULT;
 	}
 	cmd[count] = '\0';
-	session = (struct vmcp_session *)file->private_data;
+	session = file->private_data;
 	if (mutex_lock_interruptible(&session->mutex)) {
 		kfree(cmd);
 		return -ERESTARTSYS;
@@ -136,7 +136,7 @@
 	int __user *argp;
 	int temp;
 
-	session = (struct vmcp_session *)file->private_data;
+	session = file->private_data;
 	if (is_compat_task())
 		argp = compat_ptr(arg);
 	else