tidy do_mq_open() up a bit

static int do_mq_open(const char __user *u_name, int oflag, umode_t mode,

		      struct mq_attr *attr)

{

	struct path path;

	struct vfsmount *mnt = current->nsproxy->ipc_ns->mq_mnt;

	struct dentry *root = mnt->mnt_root;

	struct filename *name;

	struct path path;

	int fd, error;

	struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;

	struct vfsmount *mnt = ipc_ns->mq_mnt;

	struct dentry *root = mnt->mnt_root;

	int ro;

	audit_mq_open(oflag, mode, attr);

		goto out_putname;

	ro = mnt_want_write(mnt);	/* we'll drop it in any case */

	error = 0;

	inode_lock(d_inode(root));

	path.dentry = lookup_one_len(name->name, root, strlen(name->name));

	if (IS_ERR(path.dentry)) {

		goto out_putfd;

	}

	path.mnt = mntget(mnt);

	error = prepare_open(path.dentry, oflag, ro, mode, name, attr);

	if (!error) {

		struct file *file = dentry_open(&path, oflag, current_cred());