This patch makes nfsd_open use init_private_file to initilize
the file pointer the caller had allocated on stack.  In addition
a number of small cleanups:

 - format comments to be readable on 80char ANSI terminal
 - don't fop_get (and fop_put in nfsd_close), out file already
   is a reference to the inode so they can't go away.
 - don't decrement f_count on failure - it won't be checked anyway
 - don't check for filp->f_op n nfsd_close, it can't be NULL