usb: gadget: udc: Avoid tasklet passing a global

There's no reason for the tasklet callback to set an argument since it
always uses a global. Instead, use the global directly, in preparation
for converting the tasklet subsystem to modern callback conventions.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Kees Cook <keescook@chromium.org>

drivers/usb/gadget/udc/snps_udc_core.c

@@ -96,9 +96,7 @@ static int stop_pollstall_timer;
 static DECLARE_COMPLETION(on_pollstall_exit);
 
 /* tasklet for usb disconnect */
-static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
-		(unsigned long) &udc);
-
+static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect, 0);
 
 /* endpoint names used for print */
 static const char ep0_string[] = "ep0in";
@@ -1661,7 +1659,7 @@ static void usb_disconnect(struct udc *dev)
 /* Tasklet for disconnect to be outside of interrupt context */
 static void udc_tasklet_disconnect(unsigned long par)
 {
-	struct udc *dev = (struct udc *)(*((struct udc **) par));
+	struct udc *dev = udc;
 	u32 tmp;
 
 	DBG(dev, "Tasklet disconnect\n");