freebsd11_network: Add another missing NULL check to taskqueue_free.

Also add missing \ns to the new printfs.

src/libs/compat/freebsd11_network/callout.cpp

@@ -213,7 +213,7 @@ _callout_stop_safe(struct callout *c, int safe)
 	MutexLocker locker(sLock);
 
 	if (c == NULL) {
-		printf("_callout_stop_safe called with NULL callout");
+		printf("_callout_stop_safe called with NULL callout\n");
 		return 0;
 	}
 

src/libs/compat/freebsd11_network/taskqueue.c

@@ -220,6 +220,11 @@ taskqueue_start_threads(struct taskqueue **taskQueue, int count, int priority,
 void
 taskqueue_free(struct taskqueue *taskQueue)
 {
+	if (taskQueue == NULL) {
+		printf("taskqueue_free called with NULL taskqueue\n");
+		return;
+	}
+
 	/* lock and  drain list? */
 	taskQueue->tq_flags &= ~TQ_FLAGS_ACTIVE;
 	if (!taskQueue->tq_fast)
@@ -248,7 +253,7 @@ taskqueue_drain(struct taskqueue *taskQueue, struct task *task)
 	cpu_status status;
 
 	if (taskQueue == NULL) {
-		printf("taskqueue_drain called with NULL taskqueue");
+		printf("taskqueue_drain called with NULL taskqueue\n");
 		return;
 	}