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){