Fix a wrong conditional statement in oicgroup

Fix a wrong conditional statement in oicgroup

strlen(actionTypeStr) at line 790 was always 0, which is not what it meant
to be. After assign a proper string to actionTypeStr, then strlen() function
should be used.

Change-Id: I2ac7dd5750f54f59eb16e9469fc4dcec5259bcc9
Signed-off-by: Jihun Ha <jihun.ha@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/7553
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
(cherry picked from commit d7c32ded070bccb20868674705a521f82964990f)
Reviewed-on: https://gerrit.iotivity.org/gerrit/7563