rtnetlink: allow using zero MAC address in rtnl_fdb_{add,del}

This is required for multiple default destinations management in VXLAN

Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 9007533..3de7408 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2109,10 +2109,6 @@
 	}
 
 	addr = nla_data(tb[NDA_LLADDR]);
-	if (is_zero_ether_addr(addr)) {
-		pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n");
-		return -EINVAL;
-	}
 
 	err = -EOPNOTSUPP;
 
@@ -2210,10 +2206,6 @@
 	}
 
 	addr = nla_data(tb[NDA_LLADDR]);
-	if (is_zero_ether_addr(addr)) {
-		pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ether address\n");
-		return -EINVAL;
-	}
 
 	err = -EOPNOTSUPP;