[PATCH] fix oops in proc_kill_inodes()

proc_kill_inodes() walks the s_files list, playing with ->f_dentry.

But there is a window in which __fput() will leave a file on that list with a
null f_dentry and f_vfsmnt.

I'm not sure it was ever confirmed that this fixed the reported oops, but it
seems much better to set those fields to null _after_ removing the filp from
the list.

(Actually, there's no need to null those pointers out at all.  But whatever;
it caught a bug).

fs/file_table.c

@@ -183,9 +183,9 @@ void __fput(struct file *file)
 	fops_put(file->f_op);
 	if (file->f_mode & FMODE_WRITE)
 		put_write_access(inode);
+	file_kill(file);
 	file->f_dentry = NULL;
 	file->f_vfsmnt = NULL;
-	file_kill(file);
 	file_free(file);
 	dput(dentry);
 	mntput(mnt);