Core: Clean up here and there.

*replase postfix iterator increment\decrement with prefix in cycles
*replase strlen(*char) != 0 with *char[0] != '\0'
*replase strlen(rStr.c_str()) with rStr.length()

src/server/game/AI/SmartScripts/SmartAI.cpp

@@ -235,7 +235,7 @@ void SmartAI::EndPath(bool fail)
             }
         }else
         {
-            for (ObjectList::iterator iter = targets->begin(); iter != targets->end(); iter++)
+            for (ObjectList::iterator iter = targets->begin(); iter != targets->end(); ++iter)
             {
                 if (GetScript()->IsPlayer((*iter)))
                 {
@@ -401,7 +401,7 @@ bool SmartAI::IsEscortInvokerInRange()
             }
         }else
         {
-            for (ObjectList::iterator iter = targets->begin(); iter != targets->end(); iter++)
+            for (ObjectList::iterator iter = targets->begin(); iter != targets->end(); ++iter)
             {
                 if (GetScript()->IsPlayer((*iter)))
                 {

src/server/game/AI/SmartScripts/SmartScriptMgr.h

@@ -1153,7 +1153,6 @@ struct SmartScriptHolder
         runOnce = false;
         link = 0;
         entryOrGuid = 0;
-        link = 0;
         event_id = 0;
         enableTimed = false;
     }