drm/msm: fix workqueue leak on bind errors

Make sure to destroy the workqueue also in case of early errors during
bind (e.g. a subcomponent failing to bind).

Since commit c3b790ea07a1 ("drm: Manage drm_mode_config_init with
drmm_") the mode config will be freed when the drm device is released
also when using the legacy interface, but add an explicit cleanup for
consistency and to facilitate backporting.

Fixes: 060530f1ea67 ("drm/msm: use componentised device support")
Cc: [e-mail] # 3.15
Cc: Rob Clark <[e-mail]>
Signed-off-by: Johan Hovold <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/525093/
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Baryshkov <[e-mail]>

drivers/gpu/drm/msm/msm_drv.c

···
 
 	ret = msm_init_vram(ddev);
 	if (ret)
-		goto err_put_dev;
+		goto err_cleanup_mode_config;
 
 	/* Bind all our sub-components: */
 	ret = component_bind_all(dev, ddev);
···
 
 err_deinit_vram:
 	msm_deinit_vram(ddev);
+err_cleanup_mode_config:
+	drm_mode_config_cleanup(ddev);
+	destroy_workqueue(priv->wq);
 err_put_dev:
 	drm_dev_put(ddev);