"resource: provide new functions to walk through resources" breaks UML

[Richard Weinberger]

Hi Vivek,

Daniel Walter reported that UML is currently broken.
The offending commit is:

commit 8c86e70acead629aacb4afcd818add66bf6844d9
Author: Vivek Goyal <vgoyal@xxxxxxxxxx>
Date:   Fri Aug 8 14:25:50 2014 -0700

    resource: provide new functions to walk through resources

It dies in next_resource():
        /* Caller wants to traverse through siblings only */
        if (sibling_only)
                return p->sibling;

because p is NULL.
Please note that UML has no iomem, maybe this is the problem...

Thanks,
//richard
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