connection: remove redundant assignment

the code is something like:

  if (object == NULL && ...) {
      object = NULL;
      return;
  }

first, the object is already NULL, second, the assignment has no effect
since we return from the function right away

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>

src/connection.c

@@ -838,7 +838,6 @@ wl_closure_lookup_objects(struct wl_closure *closure, struct wl_map *objects)
 			} else if (object == NULL && id != 0) {
 				wl_log("unknown object (%u), message %s(%s)\n",
 				       id, message->name, message->signature);
-				object = NULL;
 				errno = EINVAL;
 				return -1;
 			}