Segmentation fault if %H used and no path is given

[Massimo Santini]

Hi, I've stumbled across this:

        $ find -printf '%H'
        Segmentation fault

it happens every time, while

        $ find . -printf '%H'
        Segmentation fault

prints dots, as expected.

It is very probably a trivial out of bound access to argv, but in this
moment unfortunately I don't have time to fix it myself.  As soon as I'll
have the fix I'll submit the patch, unless you already fixed it :)

Thanks for your time and help,
        Massimo Santini