drm/i915/gvt: request srcu_read_lock before checking if one gfn is valid

Submitted by Weinan Li on Sept. 13, 2018, 5:44 a.m.

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Submitted Sept. 13, 2018, 5:44 a.m.
Last Updated Sept. 17, 2018, 1:55 a.m.
Revision 2

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