*Fix the bug that some mount spells show two mounts, one on the other.

--HG--
branch : trunk

src/game/SpellAuras.cpp

@@ -2768,6 +2768,11 @@ void AuraEffect::HandleAuraMounted(bool apply, bool Real)
         if (minfo)
             display_id = minfo->modelid;
 
+        //some spell has one aura of mount and one of vehicle
+        for(uint32 i = 0; i < MAX_SPELL_EFFECTS; ++i)
+            if(GetSpellProto()->Effect[i] == SPELL_EFFECT_SUMMON
+                && GetSpellProto()->EffectMiscValue[i] == GetMiscValue())
+                display_id = 0;
         m_target->Mount(display_id);
     }
     else

src/game/Unit.cpp

@@ -9582,12 +9582,10 @@ float Unit::GetPPMProcChance(uint32 WeaponSpeed, float PPM, const SpellEntry * s
 
 void Unit::Mount(uint32 mount)
 {
-    if(!mount)
-        return;
-
     RemoveAurasWithInterruptFlags(AURA_INTERRUPT_FLAG_MOUNT);
 
-    SetUInt32Value(UNIT_FIELD_MOUNTDISPLAYID, mount);
+    if(mount)
+        SetUInt32Value(UNIT_FIELD_MOUNTDISPLAYID, mount);
 
     SetFlag( UNIT_FIELD_FLAGS, UNIT_FLAG_MOUNT );