ibmvnic: Fix possibly uninitialized old_num_tx_queues variable warning.

GCC 7.5 reports:
../drivers/net/ethernet/ibm/ibmvnic.c: In function 'ibmvnic_reset_init':
../drivers/net/ethernet/ibm/ibmvnic.c:5373:51: warning: 'old_num_tx_queues' may be used uninitialized in this function [-Wmaybe-uninitialized]
../drivers/net/ethernet/ibm/ibmvnic.c:5373:6: warning: 'old_num_rx_queues' may be used uninitialized in this function [-Wmaybe-uninitialized]

The variable is initialized only if(reset) and used only if(reset &&
something) so this is a false positive. However, there is no reason to
not initialize the variables unconditionally avoiding the warning.

Fixes: 635e442f ("ibmvnic: merge ibmvnic_reset_init and ibmvnic_init")
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ibm/ibmvnic.c

@@ -5219,16 +5219,14 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
 {
 	struct device *dev = &adapter->vdev->dev;
 	unsigned long timeout = msecs_to_jiffies(20000);
-	u64 old_num_rx_queues, old_num_tx_queues;
+	u64 old_num_rx_queues = adapter->req_rx_queues;
+	u64 old_num_tx_queues = adapter->req_tx_queues;
 	int rc;
 
 	adapter->from_passive_init = false;
 
-	if (reset) {
-		old_num_rx_queues = adapter->req_rx_queues;
-		old_num_tx_queues = adapter->req_tx_queues;
+	if (reset)
 		reinit_completion(&adapter->init_done);
-	}
 
 	adapter->init_done_rc = 0;
 	rc = ibmvnic_send_crq_init(adapter);