bond_3ad.c avoid possible null deref

A few lines earlier we assume that best->slave could be either null or non-null so
we should check it here as well.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 0fb7a49..822f586 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1580,7 +1580,7 @@
 		// check if any partner replys
 		if (best->is_individual) {
 			pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
-				   best->slave->dev->master->name);
+				   best->slave ? best->slave->dev->master->name : "NULL");
 		}
 
 		best->is_active = 1;