staging: rts5139: make thrts5139_usb_idse local variable static in rts51x.c

Make the local variable rts5139_usb_ids static

Fix the following sparse warnings in rts51x.c

CHECK   drivers/staging/rts5139/rts51x.c
drivers/staging/rts5139/rts51x.c:835:22: warning: symbol 'rts5139_usb_ids' was not declared. Should it be static?
Signed-off-by: Ana Rey <anarey@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

drivers/staging/rts5139/rts51x.c

@@ -832,7 +832,7 @@ static void rts51x_disconnect(struct usb_interface *intf)
  * Initialization and registration
  ***********************************************************************/
 
-struct usb_device_id rts5139_usb_ids[] = {
+static struct usb_device_id rts5139_usb_ids[] = {
 	{USB_DEVICE(0x0BDA, 0x0139)},
 	{USB_DEVICE(0x0BDA, 0x0129)},
 	{}			/* Terminating entry */