Staging: tm6000: check usb_alloc_urb() return

usb_alloc_urb() can return NULL so check for that and return
-ENOMEM if it happens.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/tm6000/tm6000-input.c

@@ -313,6 +313,8 @@ int tm6000_ir_int_start(struct tm6000_core *dev)
 		return -ENODEV;
 
 	ir->int_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!ir->int_urb)
+		return -ENOMEM;
 
 	pipe = usb_rcvintpipe(dev->udev,
 		dev->int_in.endp->desc.bEndpointAddress