Add more warnings check and fix warnings

Author: tony-josi-aws

CMakeLists.txt

@@ -197,6 +197,7 @@ add_compile_options(
     $<$<COMPILE_LANG_AND_ID:C,Clang,GNU>:-Wextra>
     $<$<COMPILE_LANG_AND_ID:C,Clang,GNU>:-Wpedantic>
     $<$<COMPILE_LANG_AND_ID:C,Clang,GNU>:-Werror>
+    $<$<COMPILE_LANG_AND_ID:C,Clang,GNU>:-Wunused-variable>
     $<$<COMPILE_LANG_AND_ID:C,Clang>:-Weverything>
 
     # TODO: Add in other Compilers here.

source/FreeRTOS_DNS_Parser.c

@@ -313,10 +313,9 @@
         xSet.usPortNumber = usPort;
         xSet.ppxLastAddress = &( xSet.pxLastAddress );
 
-        #if ( ipconfigUSE_LLMNR == 1 )
-            uint16_t usType = 0U;
-            uint16_t usClass = 0U;
-        #endif
+        uint16_t usType = 0U;
+        uint16_t usClass = 0U;
+
         #if ( ipconfigUSE_DNS_CACHE == 1 ) || ( ipconfigDNS_USE_CALLBACKS == 1 )
             xSet.xDoStore = xExpected;
         #endif
@@ -629,6 +628,10 @@
             /* The IP-address found will be returned. */
         }
 
+
+        ( void ) usType;
+        ( void ) usClass;
+
         return ulIPAddress;
     }