USB: remove unnecessary type casting of urb->context

urb->context code cleanup

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index a100a52..5fc2012 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -478,7 +478,7 @@
 
 static void visor_write_bulk_callback (struct urb *urb)
 {
-	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+	struct usb_serial_port *port = urb->context;
 	struct visor_private *priv = usb_get_serial_port_data(port);
 	int status = urb->status;
 	unsigned long flags;
@@ -502,7 +502,7 @@
 
 static void visor_read_bulk_callback (struct urb *urb)
 {
-	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+	struct usb_serial_port *port = urb->context;
 	struct visor_private *priv = usb_get_serial_port_data(port);
 	unsigned char *data = urb->transfer_buffer;
 	int status = urb->status;
@@ -553,7 +553,7 @@
 
 static void visor_read_int_callback (struct urb *urb)
 {
-	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+	struct usb_serial_port *port = urb->context;
 	int status = urb->status;
 	int result;