_rtl_pci_rx_interrupt uses rtlpci->rx_ring[rx_queue_idx].idx a
few times, so store it in a separate variable.
Signed-off-by: NMike McCormack <mikem@ring3k.org>
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>