drm/i915: avoid "may be used uninitialized" warnings

[Sreedhar Donelli]

 HI All,
 
compilation issue on kernel-4.10-rc4 is resolved and i created a patch file.
please find the attachment for patch file.

I have taken this issue from below link

https://lkml.org/lkml/2017/1/16/89



Thanks & Regards
 Sreedhar Donelli
 Tata Consultancy Services
 Ph:-   +91 8019039399
 Cell:- +91 8019039399
 Mailto: sreedhar.donelli at tcs.com
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