modify about rule of coding.

modify about rule of coding.

this patch include,
1. modify if statement and while statement about rule of coding.
2. remove unused function.

Change-Id: I73117fcc15581dfaff435cd5922f14c91356c358
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13357
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>