Remove unused variable assignments

exceptions/updates/MDFileUploadNotAcceptedException.php

@@ -13,8 +13,7 @@ final class MDFileUploadNotAcceptedException extends Exception {
      */
     public function errorMessage() {
         //error message
-        $errorMsg = $this->getMessage();
-        return $errorMsg;
+        return $this->getMessage();
 
     }
 }