fixed to convert Result issue related OC_EH_VALID, OC_STACK_SLOW_RESOURCE

fixed to convert Result issue related OC_EH_VALID, OC_STACK_SLOW_RESOURCE

when return value in entity handler is set OC_EH_VALID, OC_EH_SLOW,
Error response was sent automatically.

Change-Id: Ica8042aab4e91ec8d276cde1ee2b8e6cd4216997
Signed-off-by: jihwan.seo <jihwan.seo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10779
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>