https://issues.apache.org/bugzilla/show_bug.cgi?id=55582
Correct concurrency issue that can result in two instances of JspServletWrapper being created for one tag.
Patch provided by Sheldon Shao.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1525595 13f79535-47bb-0310-9956-ffa450edef68