ofpath patch for finding devices when only sysfs is enabled

[Joseph Jezak]

Hi,

A Gentoo user reported that ofpath can't find the device when only the
sysfs (and not the obsolete proc information) is enabled. The bug report
is here: https://bugs.gentoo.org/show_bug.cgi?id=253614

The attached patch fixes the issue, but hasn't been tested very well. 
It works on my PB and the user's machine at least!

Thanks,
-Joe
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