drm/i915: Fix random indent in i915_drm_resume()

smatch complains:

	drivers/gpu/drm/i915/i915_drv.c:1616 i915_drm_resume() warn:
	inconsistent indenting
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1467470166-31717-1-git-send-email-chris@chris-wilson.co.ukReviewed-by: NMatthew Auld <matthew.auld@intel.com>