drm/i915: Tidy the tail of i915_tiling_ok()
The current tail breaks the pattern of if (check) return false, which can catch the reader out. If we move the gen2/3 power-of-two test into the earlier gen2/3 branch, we can eliminate the contrary tail. Suggested-by: NTvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170203115036.24743-1-chris@chris-wilson.co.ukReviewed-by: NTvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
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