drm/i915: Fix inconsistent indenting in vbt_panel_init()

smatch complains:
	drivers/gpu/drm/i915/intel_dsi_panel_vbt.c:657 vbt_panel_init() warn:
	inconsistent indenting

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1467470166-31717-6-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>