audio duration measure fix

git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinx4@12707 94700074-3cef-4d97-a70e-9c8c206c02f5
audio duration measure fix (update)

git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinx4@12708 94700074-3cef-4d97-a70e-9c8c206c02f5