dpif: Fix function pointer check for bond_add.

There was typo in function pointer check in
dpif_bond_add() before calling bond_add().

Fixes: 9df6506 ("userspace: Avoid dp_hash recirculation for balance-tcp bond mode.")
Signed-off-by: Somnath Chatterjee <somnath.b.chatterjee@ericsson.com>
Acked-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

lib/dpif.c

@@ -2012,7 +2012,7 @@ dpif_meter_del(struct dpif *dpif, ofproto_meter_id meter_id,
 int
 dpif_bond_add(struct dpif *dpif, uint32_t bond_id, odp_port_t *member_map)
 {
-    return dpif->dpif_class->bond_del
+    return dpif->dpif_class->bond_add
            ? dpif->dpif_class->bond_add(dpif, bond_id, member_map)
            : EOPNOTSUPP;
 }