Closes the user database and any private stream used by getpwent.
    Format
      #include  <pwd.h>
      void endpwent  (void);
1 – Description
    The endpwent function closes the user database and any private
    stream used by getpwent.
    No value is returned. If an I/O error occurred, the function sets
    errno to EIO.
    See also getpwent, getpwuid, getpwnam, and setpwent.