Fix segfault when calling OCCancel ()

Fix segfault when calling OCCancel ()

This fixes the client side crash in IOT-733.
OCCancel () allocates a pointer that is free'd in routingutility.c.
Although the pointer was passed in as reference into routingutility and
is re-assigned with a new malloc'ed pointer, OCCancel() free's the old
pointer.
This is because there two structs that are being passed around. The
pointer that is double free'd is free'd twice as part of two DIFFERENT
structs. Got rid of the extra struct to keep things consistent and
resolve the crash.

If accepted, this changeset should be cherrypicked to 1.0.0-dev.

Change-Id: I8c961776406c02dbe7706a787bb19db53ba83853
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/3055
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
Reviewed-by: Gabriel Schulhof <gabriel.schulhof@intel.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: Patrick Lankswert <patrick.lankswert@intel.com>