redundant cast build failure after 8003120

8003120 adds a new line

   InputStream istream = (InputStream)resources.next();

but resources is already of type NamingEnumeration<InputStream>.

Building now shows

../../../src/share/classes/com/sun/naming/internal/ResourceManager.java:563: warning: [cast] redundant cast to InputStream
                        InputStream istream = (InputStream)resources.next();