Fix a defect detected by static code analyzer

Fix a defect detected by static code analyzer

Because the size of the struct CAEndpoint_t is 184 bytes,
it is better to pass a pointer of it if call-by-value is not
necessary.

Change-Id: I680cb11ba6ad18613370a76333002d7784a23178
Signed-off-by: Jaewook Jung <jw0213.jung@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18955
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: jaehyun Cho <jaehyun3.cho@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>