* sys/netinet6/esp_core.c: pass encryption failure code up to ESP   engine, just in case the encryption routine fails.
* sys/netinet6/esp_core.c: pass encryption failure code up to ESP
  engine, just in case the encryption routine fails.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame