drm/atomic: Remove WARN_ON from drm_atomic_state_default_clear.

[Maarten Lankhorst]

This may cause a failure when atomic_free is called asynchronously.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 3efd91c0c6cb..d719ce0b10a0 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -153,8 +153,6 @@ void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 		if (!connector)
 			continue;
 
-		WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
-
 		connector->funcs->atomic_destroy_state(connector,
 						       state->connector_states[i]);
 		state->connectors[i] = NULL;