Changed priority parameter to unsigned since we don't need to use negative values and were not checking for negative to be invalid.

bacnet-stack/demo/object/ao.c

@@ -183,7 +183,7 @@ bool Analog_Output_Present_Value_Set(uint32_t object_instance,
 }
 
 bool Analog_Output_Present_Value_Relinquish(uint32_t object_instance,
-    int priority)
+    unsigned priority)
 {
     unsigned index = 0;
     bool status = false;