From Alexander Viro: In the irix_fstatfs, irix_fstatvfs we did an extra
dput(). Removed.
If, by any chance, current->files->fd[fd] will contract NULL f_dentry
we are screwed anyway - mmap, close, lseek, etc. will choke on it. Any
such case is bug in kernel and deserves oops. Removed tests for NULL
f_dentry from sysirix.c (and IMHO someday it should be done
in fs/open.c). Better die early and give better chance to find the
reason of screwup; process wouldn't survive anyway.
Pretty cosmetical change in irixioctl.c