Fix messages being queued for disconnected bridges

This occurred incorrectly when clean start was set to true.

Closes #1729. Thanks to Andreyooo.

ChangeLog.txt

@@ -7,6 +7,8 @@ Broker:
 - Don't quit with an error if opening the log file isn't possible.
  Closes #821.
 - Fix bridge topic remapping when using "" as the topic. Closes #1749.
+- Fix messages being queued for disconnected bridges when clean start was
+ set to true. Closes #1729.
 
 Client library:
 - Improved documentation around connect callback return codes. Close #1730.

src/database.c

@@ -394,6 +394,10 @@ int db__message_insert(struct mosquitto_db *db, struct mosquitto *context, uint1
  }
  }
  }
+ if(context->bridge && context->bridge->clean_start == true){
+ mosquitto_property_free_all(&properties);
+ return 2;
+ }
  }
 
  if(context->sock != INVALID_SOCKET){