be2net: use eq-id to calculate cev-isr reg offset

cev-isr reg offset for each function is better calculated using (any) eq-id
alloted to that function instead of using pci-func number(which
does not work in some configurations...)

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index 6f26338..626b76c 100644
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -1350,7 +1350,7 @@
 	int isr;
 
 	isr = ioread32(adapter->csr + CEV_ISR0_OFFSET +
-			be_pci_func(adapter) * CEV_ISR_SIZE);
+		(adapter->tx_eq.q.id/ 8) * CEV_ISR_SIZE);
 	if (!isr)
 		return IRQ_NONE;