drivers/isdn: Remove unnecessary casts of private_data

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index b0a4a69..f80a7c4 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -691,7 +691,7 @@
 static ssize_t
 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 {
-	struct capidev *cdev = (struct capidev *)file->private_data;
+	struct capidev *cdev = file->private_data;
 	struct sk_buff *skb;
 	size_t copied;
 	int err;
@@ -726,7 +726,7 @@
 static ssize_t
 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 {
-	struct capidev *cdev = (struct capidev *)file->private_data;
+	struct capidev *cdev = file->private_data;
 	struct sk_buff *skb;
 	u16 mlen;
 
@@ -773,7 +773,7 @@
 static unsigned int
 capi_poll(struct file *file, poll_table * wait)
 {
-	struct capidev *cdev = (struct capidev *)file->private_data;
+	struct capidev *cdev = file->private_data;
 	unsigned int mask = 0;
 
 	if (!cdev->ap.applid)