i965_drv_video: release mfd context

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>

i965_drv_video/gen6_mfd.c

@@ -1425,6 +1425,7 @@ gen6_mfd_terminate(VADriverContextP ctx)
     struct i965_media_state *media_state = &i965->media_state;
     struct gen6_mfd_context *gen6_mfd_context = media_state->private_context;
 
+    if (gen6_mfd_context) {
         dri_bo_unreference(gen6_mfd_context->post_deblocking_output.bo);
         gen6_mfd_context->post_deblocking_output.bo = NULL;
 
@@ -1446,6 +1447,10 @@ gen6_mfd_terminate(VADriverContextP ctx)
         dri_bo_unreference(gen6_mfd_context->bitplane_read_buffer.bo);
         gen6_mfd_context->bitplane_read_buffer.bo = NULL;
 
+        free(gen6_mfd_context);
+    }
+
+    media_state->private_context = NULL;
     return True;
 }