Simplify.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1518128 13f79535-47bb-0310-9956-ffa450edef68
Remove code that duplicates code in super.available() which is called immediately before the duplicate code.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1518133 13f79535-47bb-0310-9956-ffa450edef68