Addressed build warnings in resource folder.

Addressed build warnings in resource folder.

Fixed compile-time warnings regarding
* not handling a enumeration value in switch case of OCException
* unused exit label and
* comparison between signed and unsigned integer expressions
in resource/csdk/ and resource/src folders.

Change-Id: Ia2d00ec335db56a5070cbe222093d392dd3a531c
Signed-off-by: Ravi Nanjundappa <nravi.n@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1182
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Erich Keane <erich.keane@intel.com>