Removed memory leaks in CA Layer

Removed memory leaks in CA Layer

These memory leaks are reported by Valgrind.
The blockwise-transfer was not properly free the memory
that was allocated.

Change-Id: Ibfefc94879fc31f562139e0bc68b53b4a3b34ff8
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2400
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>