Change argument named 'key' to pass local variable key instead of cac…

…hePath

src/FileCache/FileCache.cs

@@ -850,7 +850,7 @@ public override object Get(string key, string regionName = null)
                     if (payload.Policy.SlidingExpiration > new TimeSpan())
                     {
                         payload.Policy.AbsoluteExpiration = DateTime.Now.Add(payload.Policy.SlidingExpiration);
-                        WriteHelper(PayloadWriteMode, cachedItemPath, payload, regionName, true);
+                        WriteHelper(PayloadWriteMode, key, payload, regionName, true);
                     }
 
                 }