Description of problem:
nr_files is supposed to represent the number of files opened in posix.
Present logic doesn't seem to handle anon-fds because of which the
counts would always be wrong.
    
I don't remember anyone using this value in debugging any problem probably
because we always have 'ls -l /proc/<pid>/fd' which not only prints the
fds that are active but also prints their paths. It also handles directories
and anon-fds which actually opened the file. So it is better to remove this code instead of fixing the buggy logic to have the nr_files.


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