drm: Only take cursor locks when the cursor plane exists

I thought I've fixed this, but maybe not. Anyway, clearly broken, and
easy fix.

Cc: Tony Lindgren <[email protected]>
Reported-by: Tony Lindgren <[email protected]>
Fixes: b95ff0319a82 ("drm: Remove drm_modeset_(un)lock_crtc")
Cc: Harry Wentland <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Cc: [email protected]
Signed-off-by: Daniel Vetter <[email protected]>
Tested-by: Tony Lindgren <[email protected]>
Reviewed-by: Daniel Stone <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

0 files changed, 0 insertions, 0 deletions