fix panic

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

core/server.go

@@ -255,6 +255,9 @@ func FetchFile(client *Client, file *os.File, stat os.FileInfo, p *Path, newFile
 		// Get file read lock
 		cached.RLock()
 
+		// Get contents from file
+		content = cached.Content().(FileContent)
+
 		// Check for file freshness
 		if !cached.IsFresh() {
 			// Try upgrade file lock, else error out (have to remember to unlock!!)
@@ -263,9 +266,6 @@ func FetchFile(client *Client, file *os.File, stat os.FileInfo, p *Path, newFile
 				return errors.NewError(MutexUpgradeErr)
 			}
 
-			// Get contents from file
-			content = cached.Content().(FileContent)
-
 			// Refresh file contents
 			err := content.Load(p, file)
 			if err != nil {