cleaned clang compile warnings

src/bacnet/basic/binding/address.c

@@ -760,7 +760,7 @@ int address_list_encode(uint8_t *apdu, unsigned apdu_len)
     /* FIXME: I really shouild check the length remaining here but it is
        fairly pointless until we have the true length remaining in
        the packet to work with as at the moment it is just MAX_APDU */
-    apdu_len = apdu_len;
+    (void)apdu_len;
     /* look for matching address */
     pMatch = Address_Cache;
     while (pMatch <= &Address_Cache[MAX_ADDRESS_CACHE - 1]) {

src/bacnet/basic/object/client/device-client.c

@@ -263,7 +263,7 @@ unsigned Device_Count(void)
 
 uint32_t Device_Index_To_Instance(unsigned index)
 {
-    index = index;
+    (void)index;
     return Object_Instance_Number;
 }
 

src/bacnet/basic/object/device.c

@@ -523,7 +523,7 @@ unsigned Device_Count(void)
 
 uint32_t Device_Index_To_Instance(unsigned index)
 {
-    index = index;
+    (void)index;
     return Object_Instance_Number;
 }
 

src/bacnet/basic/object/trendlog.c

@@ -1726,8 +1726,7 @@ void trend_log_timer(uint16_t uSeconds)
     int iCount = 0;
     time_t tNow = 0;
 
-    /* unused parameter */
-    uSeconds = uSeconds;
+    (void)uSeconds;
     /* use OS to get the current time */
     tNow = time(NULL);
     for (iCount = 0; iCount < MAX_TREND_LOGS; iCount++) {

src/bacnet/basic/service/h_cov.c

@@ -212,8 +212,7 @@ static int cov_encode_subscription(
     BACNET_OCTET_STRING octet_string;
     BACNET_ADDRESS *dest = NULL;
 
-    /* FIXME: unused parameter */
-    max_apdu = max_apdu;
+    (void)max_apdu;
     if (!cov_subscription) {
         return 0;
     }

src/bacnet/basic/service/h_ucov.c

@@ -65,7 +65,7 @@ void handler_ucov_notification(
     int len = 0;
 
     /* src not needed for this application */
-    src = src;
+    (void)src;
     /* create linked list to store data if more
        than one property value is expected */
     bacapp_property_value_list_init(&property_value[0], MAX_COV_PROPERTIES);

src/bacnet/basic/sys/debug.c

@@ -56,6 +56,6 @@ void debug_printf(const char *format, ...)
 #else
 void debug_printf(const char *format, ...)
 {
-    format = format;
+    (void)format;
 }
 #endif