Fix minor cpplint problems.

Signed-off-by: Chris Lalancette <[email protected]>

rmw_zenoh_cpp/src/detail/liveliness_utils.cpp

@@ -192,7 +192,7 @@ std::optional<rmw_qos_profile_t> keyexpr_to_qos(const std::string & keyexpr)
   // Get the history depth.
   errno = 0;
   char * endptr;
-  unsigned long num = strtoul(history_parts[1].c_str(), &endptr, 10);
+  size_t num = strtoul(history_parts[1].c_str(), &endptr, 10);
   if (endptr == history_parts[1].c_str()) {
     // No values were converted, this is an error
     RMW_SET_ERROR_MSG("no valid numbers available");

rmw_zenoh_cpp/src/detail/rmw_data_types.cpp

@@ -95,7 +95,6 @@ void rmw_subscription_data_t::add_new_message(
       z_drop(z_move(old->payload));
       message_queue_.pop_front();
     }
-
   }
 
   message_queue_.emplace_back(std::move(msg));

rmw_zenoh_cpp/src/rmw_qos.cpp

@@ -28,7 +28,6 @@ rmw_qos_profile_check_compatible(
   char * reason,
   size_t reason_size)
 {
-
   // In Zenoh, publishers do not have any reliability settings.
   // A publisher and subscription are only incompatible if the durability of the publisher is
   // TRANSIENT_LOCAL but that of the subscription is not. In such a scenario, a late-joining