USB: r8a66597-hcd: fix NULL access

This patch fixes the problem that accesses NULL pointer
when disconnected a cable while play music with usb-speaker.
Signed-off-by: NYoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/r8a66597-hcd.c

@@ -47,7 +47,7 @@ MODULE_DESCRIPTION("R8A66597 USB Host Controller Driver");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Yoshihiro Shimoda");
 
-#define DRIVER_VERSION	"9 May 2007"
+#define DRIVER_VERSION	"29 May 2007"
 
 static const char hcd_name[] = "r8a66597_hcd";
 
@@ -544,6 +544,9 @@ static void pipe_toggle_restore(struct r8a66597 *r8a66597,
 	unsigned char endpoint = usb_pipeendpoint(urb->pipe);
 	unsigned short *toggle = get_toggle_pointer(dev, urb->pipe);
 
+	if (!toggle)
+		return;
+
 	r8a66597_pipe_toggle(r8a66597, pipe, *toggle & (1 << endpoint));
 }