Minor tweaks to generics on API (more lenient)

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@15874 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/transaction/RetryingTransactionHelper.java

@@ -451,7 +451,6 @@ public class RetryingTransactionHelper
      * @param cause     the cause to examine
      * @return          Returns the original cause if it is a valid retry cause, otherwise <tt>null</tt>
      */
-    @SuppressWarnings("unchecked")
     public static Throwable extractRetryCause(Throwable cause)
     {
         Throwable retryCause = ExceptionStackUtil.getCause(cause, RETRY_EXCEPTIONS);