Roger Pau Monné d908d2ef5e xen/gndev: use UOFF_TO_IDX instead of OFF_TO_IDX
The Xen grant table device treats the mmap offset parameter as an unsigned
type, and as so it must use the newly introduced UOFF_TO_IDX.

Sponsored by:   Citrix Systems R&D
MFC after:      2 weeks
X-MFC-with:     r313690
2017-02-23 13:14:28 +00:00
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