output: harden output deinit

If thread setup fails allow output deinit code to be called with
NULL data without crashing.

src/output.c

@@ -966,6 +966,9 @@ TmEcode OutputLoggerThreadInit(ThreadVars *tv, void *initdata, void **data)
 
 TmEcode OutputLoggerThreadDeinit(ThreadVars *tv, void *thread_data)
 {
+    if (thread_data == NULL)
+        return TM_ECODE_FAILED;
+
     LoggerThreadStore *thread_store = (LoggerThreadStore *)thread_data;
     RootLogger *logger = TAILQ_FIRST(&RootLoggers);
     LoggerThreadStoreNode *thread_store_node = TAILQ_FIRST(thread_store);