Remove compile error from returning value in void function

OpenSim/Region/CoreModules/Avatar/BakedTextures/XBakesModule.cs

@@ -149,7 +149,7 @@ namespace OpenSim.Region.CoreModules.Avatar.BakedTextures
         public void Store(UUID agentId, WearableCacheItem[] data)
         {
             if (m_URL == String.Empty)
-                return null;
+                return;
 
             MemoryStream bakeStream = new MemoryStream();
             XmlTextWriter bakeWriter = new XmlTextWriter(bakeStream, null);