cleaned clang compile warnings

src/bacnet/getevent.c

@@ -111,8 +111,7 @@ int getevent_ack_encode_apdu_data(uint8_t *apdu,
     BACNET_GET_EVENT_INFORMATION_DATA *event_data;
     unsigned i = 0; /* counter */
 
-    /* unused parameter */
-    max_apdu = max_apdu;
+    (void)max_apdu;
     if (apdu) {
         event_data = get_event_data;
         while (event_data) {
@@ -158,8 +157,7 @@ int getevent_ack_encode_apdu_end(
 {
     int apdu_len = 0; /* total length of the apdu, return value */
 
-    /* unused parameter */
-    max_apdu = max_apdu;
+    (void)max_apdu;
     if (apdu) {
         apdu_len += encode_closing_tag(&apdu[apdu_len], 0);
         apdu_len += encode_context_boolean(&apdu[apdu_len], 1, moreEvents);