drm/etnaviv: Use lockless gem BO free callback

No dev->struct_mutex anywhere to be seen.

Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1461691808-12414-17-git-send-email-daniel.vetter@ffwll.ch

drivers/gpu/drm/etnaviv/etnaviv_drv.c

@@ -497,7 +497,7 @@ static struct drm_driver etnaviv_drm_driver = {
 	.open               = etnaviv_open,
 	.preclose           = etnaviv_preclose,
 	.set_busid          = drm_platform_set_busid,
-	.gem_free_object    = etnaviv_gem_free_object,
+	.gem_free_object_unlocked = etnaviv_gem_free_object,
 	.gem_vm_ops         = &vm_ops,
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,