Using calloc instead of malloc to initialize mCoreThread

src/core_controller.c

@@ -89,7 +89,7 @@ msCoreControllerDestroy(struct msCoreController **controller_ptr) {
 }
 struct msCoreController *
 msCoreControllerNew (struct mCore *core, struct msClientConnectionData *const data) {
-    struct msCoreController *controller = malloc (sizeof *controller);
+    struct msCoreController *controller = calloc (sizeof *controller, 1);
     controller->multiplayer = NULL;
     controller->threadContext.core = core;
     controller->threadContext.userData = data;