commit ea640b305066f22db08423e95a42f59b01aa5303
Author: Peter Jones <pjones@redhat.com>
Date:   Mon Jan 12 14:15:24 2015 -0500

    Don't depend on vendor-defined calloc(n, 0) behavior.
    
    If we don't have any boot variables, we know that 0 is free, so just
    return that.
    
    Signed-off-by: Peter Jones <pjones@redhat.com>
