drm/i915: Avoid NULL dereference with component_only tv_modes
In commit d2d9f232, the guard for a valid video mode was removed. This caused the regression: kernel crash during kms graphic boot on Intel GM4500 platform https://bugzilla.redhat.com/show_bug.cgi?id=540218 This patches changes the logic slightly not to rely on a coupled variable, but to just check whether the video_modes is valid before dereferencing. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Zhenyu Wang <zhenyu.z.wang@intel.com> [ickle: Actually reference the correct bug report] Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com> Signed-off-by: Eric Anholt <eric@anholt.net>
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