drm/i915/overlay: remove redundant GEM_BUG_ON()

There's an early return for !engine->kernel_context.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220516081015.1058987-1-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_overlay.c

@@ -1399,8 +1399,6 @@ void intel_overlay_setup(struct drm_i915_private *dev_priv)
 
 	overlay->i915 = dev_priv;
 	overlay->context = engine->kernel_context;
-	GEM_BUG_ON(!overlay->context);
-
 	overlay->color_key = 0x0101fe;
 	overlay->color_key_enabled = true;
 	overlay->brightness = -19;