cppcheck: fix harmless warnings

[src/detect-engine-loader.c:272]: (error) Buffer is accessed out of bounds.
[src/flow-manager.c:742]: (error) Buffer is accessed out of bounds.
[src/flow-manager.c:906]: (error) Buffer is accessed out of bounds.

src/detect-engine-loader.c

@@ -268,7 +268,7 @@ void DetectLoaderThreadSpawn()
     for (i = 0; i < num_loaders; i++) {
         ThreadVars *tv_loader = NULL;
 
-        char name[TM_THREAD_NAME_MAX] = "";
+        char name[TM_THREAD_NAME_MAX];
         snprintf(name, sizeof(name), "%s#%02d", thread_name_detect_loader, i+1);
 
         tv_loader = TmThreadCreateCmdThreadByName(name,

src/flow-manager.c

@@ -738,7 +738,7 @@ void FlowManagerThreadSpawn()
     {
         ThreadVars *tv_flowmgr = NULL;
 
-        char name[TM_THREAD_NAME_MAX] = "";
+        char name[TM_THREAD_NAME_MAX];
         snprintf(name, sizeof(name), "%s#%02u", thread_name_flow_mgr, u+1);
 
         tv_flowmgr = TmThreadCreateMgmtThreadByName(name,
@@ -902,7 +902,7 @@ void FlowRecyclerThreadSpawn()
     {
         ThreadVars *tv_flowmgr = NULL;
 
-        char name[TM_THREAD_NAME_MAX] = "";
+        char name[TM_THREAD_NAME_MAX];
         snprintf(name, sizeof(name), "%s#%02u", thread_name_flow_rec, u+1);
 
         tv_flowmgr = TmThreadCreateMgmtThreadByName(name,