cxgb4: fix incorrect condition for using firmware LDST commands

Only contact firmware if it's alive _AND_ if use_bd (use backdoor
access) is not set when issuing FW_LDST_CMD.
Signed-off-by: NRahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: NGanesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/t4_hw.c

@@ -5090,7 +5090,7 @@ int t4_read_rss(struct adapter *adapter, u16 *map)
 
 static unsigned int t4_use_ldst(struct adapter *adap)
 {
-	return (adap->flags & FW_OK) || !adap->use_bd;
+	return (adap->flags & FW_OK) && !adap->use_bd;
 }
 
 /**