ovn-northd: fix memory leak in add_distributed_nat_routes() function

Within this function actions & match dynamic strings are used as helper
variables for adding entries into logical flow table. Variables are
used several times in order to optimize number of memory allocations,
however at the end memory was forgotten to be deallocated.

Signed-off-by: Damijan Skvarc <damjan.skvarc@gmail.com>
Acked-by: Mark Michelson <mmichels@redhat.com>
Signed-off-by: Mark Michelson <mmichels@redhat.com>
Signed-off-by: 0-day Robot <robot@bytheb.org>

ovn/northd/ovn-northd.c

@@ -5667,6 +5667,8 @@ add_distributed_nat_routes(struct hmap *lflows, const struct ovn_port *op)
             ds_clear(&actions);
         }
     }
+    ds_destroy(&match);
+    ds_destroy(&actions);
 }
 
 static void