We accidentally forgot to set the error code on this path.  It means we
return NULL instead of an error pointer.  I looked through a bunch of
callers and I don't think it really causes a big issue, but the
documentation says we're supposed to return error pointers here.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NSerge Hallyn <serge@hallyn.com>
Signed-off-by: NJohn Johansen <john.johansen@canonical.com>