more warning fixes

src/concurrency/Lock.cpp

@@ -6,9 +6,8 @@ namespace concurrency
 {
 
 #ifdef HAS_FREE_RTOS
-Lock::Lock()
+Lock::Lock() : handle(xSemaphoreCreateBinary())
 {
-    handle = xSemaphoreCreateBinary();
     assert(handle);
     assert(xSemaphoreGive(handle));
 }