ixgbe: balance free_irq calls with request_irq calls

We were incorrectly freeing IRQs that we had not requested.  This change
corrects that by making certain we only free q_vectors that we have
requested IRQs for.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe_main.c

@@ -2597,6 +2597,11 @@ static void ixgbe_free_irq(struct ixgbe_adapter *adapter)
 
 		i--;
 		for (; i >= 0; i--) {
+			/* free only the irqs that were actually requested */
+			if (!adapter->q_vector[i]->rxr_count &&
+			    !adapter->q_vector[i]->txr_count)
+				continue;
+
 			free_irq(adapter->msix_entries[i].vector,
 				 adapter->q_vector[i]);
 		}